[Update, 11:05 a.m. ET Tuesday] This post is no longer being updated. For Tuesday's coverage, please read this story.
[Update, 11:41 p.m. ET] Stephen Segatore, a nurse who was at the medical tent near the finish line for the Boston Marathon, said emergency responders immediately went into mass-casualty mode.
"We had full trauma response at the scene," he told CNN. "We had physicians, nurses who are experienced in trauma care. We had EMTs and it was a full Level 1 trauma experience."
Segatore said he treated at least 25 people as those experienced in trauma care stepped forward while others treated people with minor injuries.
[Update, 11:35 p.m. ET] Saudi ambassador to the United StatesÂ Adel Al-JubeirÂ condemned the bombings in Boston and offered his condolences to victims' families.
â€śWhat occurred today in Boston is a heinous crime which contradicts the values of humanity.â€ťÂ he said.
[Update, 10:52 p.m. ET] The total of injured has risen to 144 people, officials at Boston area hospitals said. That includes three additional patients at Brigham and Womenâ€™s Hospital.
[Update, 10:41 p.m. ET] A law enforcement source in Boston tells CNN that investigators have a "number of active leads, and some good early progress in the forensics analysis."
[Update, 10:07 p.m. ET] Dr. Peter Fagenholz told reporters that there were 29 wounded people at Massachusetts General Hospital, eight of whom were in critical condition. Many of the people had shrapnel injuries to their lower extremites, he said.
"We have performed several amputations," he said.
There were no pediatric patients among the wounded, he said.
[Update, 9:38 p.m. ET] Dr. Allan Panter, who was near the finish line waiting for his wife who was running the race, told CNN he was standing about 20 to 25 feet from the first blast. He said he treated victims on the street after the explosion.
"I saw at least six to seven people down next to me," he said. "They protected me from the blast. One lady expired. One gentleman lost both his (lower) limbs. Most of the injuries were lower extremities. I could not figure out why the young lady had expired. I could not find any injury on her thorax."
[Update, 9:28 p.m. ET] Bill Iffrig, seen in video wearing an orange tank top and being blown over as he approached the finish line, told CNN's Piers Morgan that he was feeling OK after the blast.
"I got down to within about 15 feet of the finishing apron and heard just tremendous explosion, sounded like a bomb went off right next to me, and the shock waves just hit my whole body and my legs just started jittering around," he said. "I knew i was going down and so i ended up down on the blacktop."
Iffrig, 78, said he was assisted by one of the event volunteers, who helped him up so he could finish the race. After that, the worker looked for aid for Iffrig, who had just a scratch from his fall.
"He insisted on getting a wheelchair over there so we started to do that, but then before that was rounded up, i said my hotel's about six blocks away so I think I can make it okay. So they let me get out of there and I went on home to my wife."
[Update, 8:55 p.m. ET] A Saudi national with a leg wound was under guard at a Boston hospital in connection with the bombings at the Boston Marathon, but investigators cannot say he is involved at this time and he is not in custody, a law enforcement official said Monday evening.
[Update, 8:54 p.m. ET] Three people were killed in the bombings, Boston Police Commissioner Ed Davis told reporters Monday night, raising the toll by one.
[Update, 8:52 p.m. ET] The FBI is taking the lead in the investigation, Rick DesLauriers, FBI Special Agent in Charge of the Boston field office, told reporters.
[Update, 8:44 p.m.ET ] The Boston Celtics home game against the Indiana Pacers, originally scheduled for Tuesday, was canceled, the NBA announced. With the regular season almost at its end, the contest will not be made up.
[Update, 8:36 p.m. ET] Investigators have warned law enforcement officers to be on the lookout for a "darker-skinned or black male" with a possible foreign accent in connection with Monday's bombings at the Boston Marathon, according to a law enforcement advisory obtained by CNN.
The man was seen with a black backpack and sweatshirt and was trying to get into a restricted area about five minutes before the first explosion, the lookout notice states.
[Update, 8:35 p.m.] Hospital workers have treated 141 people after the Boston Marathon bombings, officials at those facilities said Monday night. Two people died in the terror attack, including an 8-year-old boy, a state law enforcement source said.
[Update, 8:32 p.m.]Â A statement has been issued by the race organizers: "The Boston Athletic Association extends its deepest sympathies to all those who were affected in any way by todays events.
"Today is a sad day for the City of Boston, for the running community, and for all those who were here to enjoy the 117th running of the Boston Marathon. What was intended to be a day of joy ...and celebration quickly became a day in which running a marathon was of little importance.
"We can confirm that all of the remaining runners who were out on the course when the tragic events unfolded have been returned to a community meeting area.
"At this time, runners bags in Boston which remain unclaimed may be picked up by runners presenting their bib number or proof of race participation at the Castle, at 101 Arlington Street, in Boston.
"At this time, we are cooperating with the City of Boston, the Commonwealth of Massachusetts, and all federal law enforcement officials.
"We would like to thank the countless people from around the world who have reached out to support us today."
[Update, 7:57 p.m. ET] Doctors are "pulling ball bearings out of people in the emergency room," a terrorism expert briefed on the investigation told CNN's Deborah Feyerick.
The same source said the blasts resulted in at least 10 lost limbs.
[Update, 7:43 p.m. ET] An 8-year-old boy was among those killed, a state law enforcement source said, according to CNN's John King.
[Update, 7:38 p.m. ET] At least 132 people - including eight children - have been injured in the bombings, according to Boston-area hospitals. Boston police earlier said that two people were killed.
At least 17 of the injured are in critical condition, and at least 25 are in serious condition, area hospitals said.
[Update, 7:08 p.m. ET] A witness, Marilyn Miller, told CNN that she was about 30 feet away from the first bomb when it went off. The second bomb came about 12 seconds after and about 50 to 100 yards away from the first, according to authorities and an analysis of video from the site.
Miller was waiting for a runner who, it turns out, was probably about 10 minutes away from the finish line.
"We saw injuries all around us," Miller said. Someone was putting pressure on a woman's neck. "A little boy, his leg was torn up. A woman, (people) were (shouting), 'Critical, critical, get out of out way!'"
[Update, 6:51 p.m. ET] At least 110 people have been injured in the bombings, according to Boston-area hospitals.
[Update, 6:49 p.m. ET] Boston cell phone services were overloaded in the wake of the blast, slowing the city's network dramatically and hampering the investigation in the early going, federal law enforcement officials told CNN.
Unconfirmed rumors began circulating on social media and elsewhere that law enforcement had shut down cell service to prevent more explosives from being detonated remotely. But mobile companies were saying that was never the case, CNN's Doug Gross reports.
"Verizon Wireless has not been asked by any government agency to turn down its wireless service," a spokesman for that company told CNN. "Any reports to that effect are inaccurate."
In other media reports, Sprint similarly denied being asked to shut down service.
Online, Bostonians were being encouraged to stay off of their mobile phones except for emergencies and even open up their wireless connections to help take the load off of the cellular data network.
"If you live or run a business in #Boston near bombsite (please) open your wifi for people to use," tweeted Disaster Tech Lab, an Irish nonprofit dedicated to providing technology to assist in emergency situations.
[Update, 6:47 p.m. ET] Initial tests indicate that the two bombs were small and possibly crude, with the tests not indicating any high-grade explosive material was used, a federal law enforcement official with knowledge of the investigation told CNN national security contributor and former homeland security adviser Fran Townsend.
The source said the FBI considers the incident a terrorist attack, "but they've made clear to me they do not know at this time whether those responsible for the attack were a foreign or domestic group," Townsend said.
[Update, 6:35 p.m. ET] U.S. Rep. Bill Keating, D-Massachusetts, said an unexploded device was found at a hotel on Boylston Street, and another unexploded device was found at an undisclosed location.
Keating, who is a member of the House Homeland Security committee and has spoken to law enforcement sources, tells CNN's Dierdre Walsh that the incidents were a "sophisticated, coordinated, planned attack."
[Update, 6:14 p.m. ET] More from President Obama, who just wrapped up his brief statement at the White House: "We still do not know who did this or why ... but make no mistake: We will get to the bottom of (this). We will find out who did this. We will find out why they did this. ... Any responsible groups will feel the full weight of justice."
[Update, 6:11 p.m. ET] President Barack Obama is speaking about the bombings now: â€śThe American people will say a prayer for Boston tonight, and Michelle and I send out deepest thoughts and prayers to the victims," Obama said at the White House.
[Update, 5:59 p.m. ET] John Manis, an eyewitness in his 50s, was about 200 feet away from the finish line near the Prudential building when the bombings occurred. He felt the blast to the point that it made him and others around him jump in the air, and some others around him fell down on the ground, he said, according to CNN's Eden Pontz.
Manis said he heard two blasts about five seconds apart. He said there was confusion all around him, and he was hustled into the nearby Mandarin Hotel. Officials wouldnâ€™t let them leave the hotel for a bit, and he says all who were there were all frisked by police. He said that when he left, he saw broken storefronts and lots of blood.
[Update, 5:51 p.m. ET] President Barack Obama is expected to deliver a statement at about 6:10 p.m. ET from the White House.
[Update, 5:35 p.m. ET] Google has established a person-finder related to the Boston bombings. People who are looking for someone or have information about someone can make reports there.
[Update, 5:31 p.m. ET] Boston police now appear to be backing away from their commissioner's earlier statement that a third incident - at the JFK Library 5 miles from the finish line - might have been related to the Boston Marathon blasts.
On Twitter, Boston police say: "Update JFK incident appears to be fire related."
[Update, 5:21 p.m. ET] Precautions are being taken at the White House because of the Boston explosions, CNNâ€™s Jessica Yellin reports. See that in the video below, as well as Vice President Joe Biden's reaction to the incident:
[Update, 5:17 p.m. ET] In the video below, a man describes the initial blast, saying the impact was so strong it â€śalmost blew my head off.â€ť He was not injured, but saw many people sustain horrific injuries.
[Update, 5:15 p.m. ET] The Boston Globe is reporting a much higher injury count. They report that more than 100 people are being treated for injuries, citing local hospitals.
[Update, 5:10 p.m. ET] Hospitals now say they are treating as many as 51 wounded after the bombings. Two people have been killed, according to Boston police.
[Update, 5:09 p.m. ET] It will take a long time to clear the area, because lots of people dropped bags and whatever else they had when the finish-line blasts happened. Authorities have to check all of those bags, and bomb squads "may be blowing things up over the next few hours" out of precaution, Boston Police Commissioner Ed Davis said.
In the words of Boston Globe political reporter Cynthia Needham, on Twitter:
Thousands of runners still had yet to finish the race when the bombs exploded in a spectator area along Boylston Street near the finish line, CNN executive producer Matt Frucci at the scene.
[Update, 4:58 p.m. ET] New details from Boston Police Commissioner Ed Davis:
- A third explosion happened at the John F. Kennedy Presidential Library "about a half-hour ago." The library is about 5 miles southeast of the Boston Marathon finish line.
- Police don't immediately know whether that explosion is related to the two near the Boston Marathon finish line.
- The two blasts near the finish line - along Boylston Street near Copley Square - "happened 50 to 100 yards apart."
- "We're recommending to people that they stay home ... and that they don't go anyplace and congregate in large crowds."
- Relatives of people who may be missing in the area can call the mayor's hotline at 617-635-4500.
- Anyone who has information about the bombings or saw anything suspicious can call 1-800-494-TIPS.
[Update, 4:46 p.m. ET] Massachusetts Gov. Deval Patrick says â€śthis is a horrific day in Boston."
"My thoughts and prayers are with those who have been injured," Patrick said in a statement released this afternoon. "I have been in touch with the president, Mayor Menino and our public safety leaders. Our focus is on making sure that the area around Copley Square is safe and secured. I am asking everyone to stay away from Copley Square and let the first responders do their jobs.â€ť
[Update, 4:45 p.m. ET] It appears that so many people are using cell phones in the center of Boston, consistent service is hard to get - and the overload is hampering the investigation, two federal law enforcement sources tell CNN.
[Update, 4:40 p.m. ET] Another journalist says she saw victims who lost limbs. This account is from Boston Globe political reporter Cynthia Needham:
"Outside MGH: Head of emergency medicine says 19 have been brought to MGH, six critically injured, some with amputations," she posted to Twitter.
Earlier, we noted that Boston.com sports producer Steve Silva reported that he "saw dismemberment" and "blood everywhere."
[Update, 4:37 p.m. ET] Organizers with the London Marathon, scheduled for this coming Sunday, have taken notice.
"We are deeply saddened and shocked by the news from Boston," London Marathon officials said Monday. "Our immediate thoughts are with the people there and their families. It is a very sad day for athletics and for our friends and colleagues in marathon running. Our security plan is developed jointly with the Metropolitan Police and we were in contact with them as soon as we heard the news."
[Update, 4:30 p.m. ET] Boston firefighters have found what they believe is an unexploded device after the blasts, a government official said, according to CNN's Joe Johns.
[Update, 4:27 p.m. ET] "I saw blood everywhere," Boston.com sports producer Steve Silva told Boston.com.
Silva told the news outlet that he was near the finish line when the explosions happened. He said he saw a number of injuries in the area where spectators were. He saw "someone lost their leg," and he said "people are crying, people are confused."
"It was just an explosion, it came out of nowhere," he said. "There are multiple injuries. I saw dismemberment, I saw blood everywhere. People are badly injured."
[Update, 4:19 p.m. ET] We have a new injury count: According to hospital officials, at least 28 people are being treated for injuries connected to this afternoon's blasts near the Boston Marathon finish line.
Nineteen were being treated at Massachusetts General and nine at Tufts Medical Center, officials at those facilities said. Boston police earlier put the number of victims at two dead and 22 hurt.
[Update, 4:16 p.m. ET] "People started scrambling, pushing, shoving" when the explosions happened in a sidewalk area along Boylston Street, near the finish line in the Copley Square area, says CNN executive producer Matt Frucci at the scene.
Frucci said he heard the blasts.
"After the dust settled, (I saw) six or seven people strewn about the area where the second (explosion) was.
[Update, 4:11 p.m. ET] A Red Cross website has been established to help people find loved ones in the area.
"Individuals can register themselves as safe or search for loved ones," Massachusetts' emergency management agency says.
[Update, 4:08 p.m. ET] At least two people have been killed and 22 are injured in the apparent bombings near the finish line of the Boston Marathon, Boston police say.
[Update, 4:02 p.m. ET]Â A Massachusetts General Hospital spokeswoman tells CNN 19 victimsÂ have been brought in.
[Update,3:57 p.m. ET] On their Twitter page, Boston marathon officials made this announcement: "There were two bombs that exploded near the finish line in today's Boston Marathon. We are working with law enforcement to understand what exactly has happened."
[Update, 3:53 p.m. ET] New York is taking precautions as a result of the explosions at the Boston Marathon.
In a written statement, New York Police Department Deputy Commissioner Paul Browne said: "We're stepping up security at hotels and other prominent locations in the city through deployment of the NYPD's critical response vehicles until more about the explosion is learned.
[Update, 3:45 p.m. ET] Paramedics were treating several victims at the scene, and police ordered onlookers to back away from the area. Troops from the Massachusetts National Guard were assisting police as well.
Onlooker Josh Matthews said he heard the blast, then saw police running toward the scene.
"We just heard a lot of sirens, and people were kind of frantic, and it was a bad situation, so we got out of there," he said.
[Update, 3:37 p.m.] Four victims of explosions near the Boston Marathon finish line are at the emergency room at Massachusetts General Hospital, a hospital spokeswoman told CNN. She had no information about the victims' conditions.
[Posted at 3:25 p.m. ET] A pair of explosions rocked the finish line at the Boston Marathon on Monday afternoon, injuring at least a half-dozen people, a CNN producer at the scene said.
The blasts occurred a few seconds apart, shrouding downtown Boston's Copley Square in smoke. Paramedics were treating several victims at the scene, and police ordered onlookers to back away from the area, CNN Producer Matt Frucci reported.
The explosions occurred about 2:45 p.m., about an hour after the first runners had crossed the finish line, Frucci said.
It appears it wasn't suicide bombers, so that greatly increases the likelihood it's a domestic criminal. Doesn't guarantee it, but it does increase the likelihood. Whoever it was, the person or persons are not Muslim, Christian, Jewish, Buddhist, Hindu, Atheist, or anything else. The person or persons are simply deranged criminals regardless of what they may or may not label themselves. Anybody can claim they are of any faith or other group, but that does not mean they have the right to define that faith or other group.
bzzzzzzzzzzzzzzzzzt......NYP is reporting a Saudi national is the suspect.
You guys blaming Obama are redic, probably the same people who blamed bush and blamed congress. I would love for you internet warriors to step one day in office and see how you run the show. Let's not forget you are all to blame you all voted these people in regardless of party. They have never worked together and each have their own ideas of how this country should be run, which is why it hasn't worked since republicans gained control of congress off and on for the past 20+ years. While the democrats had control for 47 years the country was more successful than anytime before or after. FACTS
Let's wait for the facts!
This sux no matter who is in office.
Cowards target innocents again. Lovely world we're creating.
8 years old and dead. These are not soldiers, they are cowards, regardless.
You turn any event into a soap box for your political agenda? Shameful.
I'm so sad to read about the 8 year old and other person who died and all the injured. How tragic. Senseless violence. I'm thinking of the families of all those affected.
Sigh...and this will change the world how? Whether it is Islamic extremists (a distinct possibility people...after all..they do sort of have a track record for this sort of thing) or equally moronic homegrown terrorists...the bottom line is that innocent people of many political persuasions and backgrounds have been hurt or killed. That should be our primary concern as a civilised society. Once all has been done that can be done for the innocent victims of this mindless and pointless atrocity, then we can look to the perpetrators, find them and then punish them as serverely as possibile (Death sounds about right to me for people who blow up innocent people including kids). If it IS Islamists, it would be nice to see the moderate Islamic population come out to condemn it a little more forcefully than usual...which is generally not much.Your silence, whilst it may be driven by shame, no doubt serves to give tacit approval to these sorts of acts in the minds of the imbeciles who perpetrate them.
Death does sound about right for people who blow up innocent civilians and kids. Do you know how many civilians and children have died due to illegal wars started by the US? Not condoning what happened here at all, it's disgusting. But let's not pretend that these rare incidents even compare to the suffering in other countries.
Mhm....I think these events will only increase in the U.S.. The U.S. has been so shielded from this type of violence but I think that's over.
They are quick to attack civilians..such cowards..throwing bombs then handing their hands...Our prayers go out to those injured and those that have lost a loved one.
Barack Obama has made the U.S. look like defenseless weaklings and fools in front of the entire world. We are sitting ducks for "all enemies, both foreign and domestic." Boston is just the latest example. What a sad and terrible day.
Notice how the rabid rightwingers are nervously mocking the situation and belittling the victims. They are sweating bullets because they know it was one of their own that did this. Just like Timothy McVeigh, just like Eric Rudolph. They are all cowards, living in their little hate-filled, treasonous, anti-Christian world.
Are you Nuts!? What does politics have to do with this? Remove your tinted glass and look at the tragedy as it is and don't paint your colors on it. Feel sorry for the victims and whoever committed this must be found and dealt with with the full measure of the law.
The 9/11 WTC attacks occured under the watch of GWB,smart guy.Get yourself a history book or a brain,whichever is readily available.Fox News is also available to complainers like yourself.Head over there.We will not miss you for even a second.
He's killed more terrorist, including Osama, than all other presidents combined. His administration has a stellar track record on defending this country. All without invading a country with no WMDs. Get your facts straight dum dum.
I am surprised how Americans posting here to use this tragedy against each other in partisan politics.
Whoever did it, maybe it is exactly what they were aiming for.
Good post. Somehow I just don't think the victims are sitting around trying to figure out how to put a political spin on this.
Mostly some angry group over the weapon program Obama and Biden proposing. It no counsedence this happened while the vice president is giving his speech
Gasem:It is not a coincidence that you were an idiot before,during,and after V.P.Biden was giving his speeech.
OMG!! You people are unbelieveable!!! People are dead and hurt and you are blaming the President, who by the way, stepped right up to offered any help that our country could offered.
Their FoxNews and right wing radical radio programming runs deep.
What is unbelieveable is that Barry will exploit the dead once again just for a photo op.
@BO Stinks You're thinking of DUHbya and Darth Cheney.
Sherry I couldn't agree with you any more than I do now. These kids nowadays are so desensitized to what death and loss really are. Shame on your comment. I will pray for you while I pray for those who are injured and lost. I hope that when something horrible happens in your life someone is there with a hand to help rather than a comment to hurt.
The human is in a degrading process. A cowardice like that deserves no comment. However, explosions like that, occurs daily in Iraq and Afghanistan without the media highlighting . The world needs to worry about the pain of others as it were their own pain. I believe that with this approach the human being would be taking an important step to be truly civilized.
Who's watch did this terror attack take place. Clue – it was not George Bush.
Clue: It doesn't matter.
It was one of your own and you know it. Just like Oklahoma City.
Jim...go read the news and catch up. Also, one of their own would not be someone that does this. Grow up.
[Update, 5:17 p.m. ET] In the video below, a man describes the initial blast, saying the impact was so strong it â€śalmost blew my head off.â€ť He was not injured, but saw many people sustain horrific injuries.
The guy is actually saying "almost blew my hat off."
We pray for our people in Boston. Our God will be help us. Please keeping pray for it.
May God Bless Boston, also in USA
Thank you, Reverend. I do not share your belief, but I appreciate your demonstration of humanity.
No group is going to claim responsibility. Everyone now knows the US is no different then East German police and we have no borders.