[Update, 11:05 a.m. ET Tuesday] This post is no longer being updated.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.
If there had been a person with gun , more people would have been killed. Shows guns are bigger killer machines.
8 year old!! RIP...prayers to parents. WHY? what that child did that to you?
II just heard that this was "an attack of freedom itself". Anytime you hear buzzwords like that, you know the federal government is behind it. 'm willing to bet Obama's left nut that this gets blamed on the North Koreans so that we will have plenty of justification for invading their country, murdering their dictator, and stealing their, um, their uh... do they have any oil in North Korea?
Oh wait. That sounds awfully familiar...
For all the people saying close the borders and what not, let's just remember, our government has no idea who did this. As of late, the bombings could have been foreign or they could have been domestic. Considering our country is in an economic crisis, one can not rule out that there may be people in our own country who believe a revolution will change things. Regardless, whoever is responsible is a coward. Unable to accept responsibility for their actions because they know the ultimate consequence. Instead of arguing about who did this, we should unite as a country and let whoever these people may be, know that we will not break and we will not sit back and let horrific events like this happen without justice. Despite how some may feel towards our countrys policies, this is YOUR country. We may all have different beliefs, backgrounds and races but the one thing we hold in common is we are all americans and we all care for our home. Stand along side and support your fellow Americans.
Care to make a wager?
That's the problem nick................. we are not "all" Americans. Many MILLION people in America are not Americans and only use our government because they are weak. Even the leader of our great nation attempts to deny the rights given to us by our forefathers and you want to preach about standing up as Americans? Give me a break. We lost America 5 years ago and until we get it back things like this will continue to happen.
I'm sorry jack actually we lost the country during the savings and loan debacle back in the Reagan administration. That's when America started down the trail to the country we live in now. Saying we lost it 5 years ago only goes to show how politically motivated your comment really is. This is yet another sad day for Americans. "We lost it 5 years ago" pfft... Give me a break; we have had 9/11, we have had the gulf war, trade center bombing, etc etc.. All these things that led to us losing our loved ones. get out of your bubble there buddy.
what is sad is most people knew this was a terror attack . Its the new america we live in .
On top of the attack on our second amendment right. There is no safety now in our once great country with these terror attacks and united nations cartel attacking our bill of rights
I think what everyone is concerned about is that Pres Obama has still not told us who was involved in Bengazzi...nobody has been held accountable or punished for that, and now this...not good as far as US security.
Obama doesn't care about security. He wants everyone to be afraid so they will give more power to government in exchange for the illusion of protection.
This is a horrible attack! I am reading thru these post and I am completely sick to my stomach that people are blaming and pointing fingers. No one knows for sure yet who did this. It is not funny that people are making this political and blaming Obama or blaming the Tea Party. No matter which side of the fence you are on politically....WHO CARES! Currently you are being nothing but selfish, hateful, & a waste of space.
thank you for your balanced and considerate reply
Jen, thanks for making an attempt to mentally stimulate so many sick minds. Some don't even have the ability to wait for ALL OF THE FACTS to be gathered by trained investigators such as FBI, local police. How stupid can one get.
What in the name of humanity are you going on about? This is actually one of the craziest posts I've ever seen...I don't understand you.
The US is sure not having a good start to the 21st century..... 911, multiple shootings, more bombings. Glad to live in Canada, but my heart goes out to all the victims. I think Obama is doing a great job compared to Bush, just can't really control a place that already has damage.
Did no one notice the man on top of the building in the picture from the finish line on the left hand side of the picture?
The candle I will light and prey for all. Pa' will keep Boston in our heart. But I no the news should be told. But really. get out of the officals face . The meadia is like puronas. or valtures.I feel like you guys suck the life out of stories. Its no wander things are screwed up. People need to have a sence of calm. Let the right people handle it. stop speculating. Stop guessing .Just stop and let them get their self together.
I think our world has come to something that no one can fix but as long as we can keep what little hope we have that someday our world will come to an era of peace and will no longer tolerate any kind of violence and hurt
Our world – with all of this new technology is becoming far too much than what the average simple mind can handle. There is so much out there that people don't know what they want and the blame always turns political. Violence is the only real thing people can associate with and half way understand. The same theory as Quantum physics and the big question of WHY? It's proven time after time that people are just dangerous and they are dangerous because they are unsure of themselves.
I can't believe I just heard in your interview with the FBI man that he used the words, "looking for someone of various ethnic backgrounds." Why do people in authority start immediately profiling ethnic races? This is poor judgement in choice of words on his part. No one knows who did this in Boston and it certainly could have been a white American. The point is racial profiling need not exist.
I agree. Timothy M. Was white (Oklahoma bomber).
I feel like their is something terribly wrong in the US. So much tragedy has happened lately, and it seems to be happening closer and closer together. It's hard to find a bright spot to look to, hard to find anything good. I know some of you are going to read this and say, "it's the democrat's fault" or "it's the republican's fault", but please, I beg you, stop playing the blame game for one moment and just LISTEN. All the problems that are going on, they are not the fault of just one side. Each and every one of us, as we are Americans, shares some of that blame. Our system is clearly broken, and now is not the time to blame someone, now is the time to fix it. Each of us has a role to play in making the country great. It starts with you reaching out to those in need, those who need help. Together, maybe we can fix this and stop tragedies from happening.
North korea attack.?