[Update 10:12 p.m.] Dzhokar Tsarnaev is currently intubated and sedated, a source who receives regular intelligence briefings on the Boston bombings said Saturday, according to CNN's Deborah Feyerick.
Earlier, a federal official, speaking on condition of anonymity, told CNN on Saturday that Tsarnaev has injuries to his throat and may not be able to talk.
Tsarnaev is being treated for wounds at Beth Israel Deaconess Medical Center. Authorities have not publicly detailed the injuries sustained by the teen, whom authorities captured on Friday night in Watertown, Massachusetts.
Massachusetts Gov. Deval Patrick told reporters on Saturday that Tsarnaev was in "serious but stable condition" and "not yet able to communicate yet."
[Update 9:22 p.m.] Two key Republicans on the House Homeland Security Committee – Rep. Mike McCaul of Texas, the panel's chairman; and Rep. Peter King of New York – will press the Obama administration for details about the FBI's questioning of Tamerlan Tsarnaev in 2011, according to a GOP congressional source.
FBI agents interviewed Tamerlan two years ago and also looked at his travel history, checked databases for derogatory information and searched for Web postings. The agency found no connection with terror groups, an FBI official told CNN.
Tamerlan Tsarnaev, who was not a U.S. citizen, traveled to Sheremetyevo, Russia, in January 2012, according to travel records provided by a U.S. official. He returned six months later.
[Update 9:03 p.m.] After the charges are filed, the Federal Public Defender Office in Boston will be appointed to represent Dzhokar Tsarnaev, according to Miriam Conrad, the federal public defender for the Massachusetts district. Conrad stressed that the office has not yet been appointed to defend him.
[Update 7:32 p.m.] Dzhokar Tsarnaev has injuries to his throat and may not be able to talk, a federal official, speaking on condition of anonymity, told CNN on Saturday.
[Update 6:17 p.m.] Sen. Carl Levin, D-Mich., chairman of the Senate Armed Services Committee, rejected calls for Dzhokar Tsarnaev to be held as an enemy combatant under the law of war. "I am not aware of any evidence so far that the Boston suspect is part of any organized group, let alone al Qaeda, the Taliban, or one of their affiliates - the only organizations whose members are subject to detention under the Authorization for Use of Military Force, as it has been consistently interpreted by all three branches of our government.
"In the absence of such evidence I know of no legal basis for his detention as an enemy combatant. To hold the suspect as an enemy combatant under these circumstances would be contrary to our laws and may even jeopardize our efforts to prosecute him for his crimes."
[Update 5:21 p.m.] A senior U.S. official tells CNN it was Russia in 2011 that asked the FBI to look at Tamerlan Tsarnaev’s activities.
[Update 2:24 p.m.] Watertown Police Chief Edward Devaeu provided the most detailed version yet of the violent events that unfolded Thursday night and the subsequent manhunt for Dzhokar Tsarnaev in an interview with CNN's Wolf Blitzer. You can read the full story here. Some of new details:
– Once police located Tsarnaev Friday evening, they used flash bang grenades before beginning to negotiate with him.
–An FBI negotiator on the second floor of the house spoke with the suspect while a helicopter above with a heat sensor recorded his movements even though he was underneath a tarp. After about 30 minutes, police got him to lift up his shirt and show his chest to prove he didn't have explosives on his body. Only then did they feel comfortable sending people in.
– Handguns, a rifle, and at least six bombs - three which had exploded - were found at the scene of Thursday night's violence in Watertown.
–During a shootout with police on Thursday night, the older brother, Tamerlan Tsarnaev, exited the vehicle he was in and started walking down the street, shooting at officers. He ran out of ammunition when he was only five or ten feet away from police. One officer then tackles him, and he and two or three others try to handcuff him.
–As they try to handcuff the older brother, the younger brother comes barreling at them in the vehicle. The officers dive out of the way, and Dzhokar runs over his brother, dragging him for a short distance. Police think this is what killed him.
[Update 1:19 p.m.] The Boston Red Sox are moments away from playing their first game in the city since Monday's bombings. The team will wear special jerseys with the word "Boston" across the front, instead or "Red Sox." The jerseys will be signed and auctioned off with proceeds going to The One Fund Boston. The team shared this picture on its Instagram page:
[Update 1:05 p.m.] President Obama will continue to receive updates on the investigation from his team throughout the day, a White House official told CNN.
[Update 12:59 p.m. ET] The campus of the University of Massachusetts-Dartmouth will remain closed Saturday, a school spokesman said, so law enforcement can complete its investigation stemming from the Boston Marathon terror attack. The university, where Dzhokar Tsarnaev was a student, is preparing to reopen Sunday, spokesman John Hoey said.
[Update 11:34 a.m. ET] Early indications are that Dzhokar Tsarnaev and Tamerlan Tsarnaev acted alone, Chief Edward Deveau of the Watertown Police Department told CNN's Wolf Blitzer.
[Update 11:33 a.m. ET] Dzhokar Tsarnaev was on the campus of University of Massachusetts-Dartmouth every day after the attack until until late Thursday, a university official told CNN. Tsarnaev attended classes as well as parties in the dorms during that period.
[Update 11:18 a.m. ET] Fifty-seven people remain hospitalized Saturday as a result of the Boston Marathon terror attack, including three in critical condition, according to the latest CNN count.
[Update 11:15 a.m. ET] Ruslan Tsarni tells CNN more about the changing religious outlook of Tamerlan Tsarnaev. Tsarni noticed changes as far back as 2009. The uncle recalls a phone conversation in which Tsarnaev called him an "infidel." The young man also told his uncle he was not concerned about work or studies because God had a plan for him. The possible radicalization of Tsarnaev began around that time under the influence of an Armenian man who was a recent convert to Islam, Ruslan Tsarni said he learned from a family acquaintance. Tsarni said his radicalization happened "right there, in the streets of Cambridge."
[Update 10:07 a.m. ET] Federal terrorism charges against Boston Marathon bombings suspect Dzhokar Tsarnaev could be filed soon, even as he remains hospitalized, a Justice Department official told CNN. The 19-year-old could also face murder charges at the state level, the source said. There is no death penalty in Massachusetts, but Tsarnaev could face that punishment at the federal level.
[Update 9:37 a.m. ET] Anzor Tsarnaev, father of the bombing suspects, reiterated that he believes his sons are not responsible for the attack. He told CNN's Nick Paton Walsh in Dagestan that his sons "never, ever" could have done something like this, and that he will travel soon to the United States.
[Update 7:34 a.m. ET] Russia wants to receive official information about the bombing suspects from the United States, a spokesman for Russian President Vladimir Putin said on state television. Russia expects there will contact between investigators of both countries.
[Update 7:16 a.m. ET] Investigators in Dagestan, where the Boston bombing suspects' parents live, will not engage with the family, unless an order comes from Moscow to do so, Russia state news reported today.
[Update 7:15 a.m. ET] The White House has published a photo of President Obama receiving the news of the capture of the suspect hiding in the boat.
[Update 6:28 a.m. ET] Want to help people injured in the Boston Marathon bombings Monday? Go to CNN's Impact Your World to find out how.
[Update 6:21 a.m. ET] Though the suspects are no longer on the loose, the work on this case is not over. There will be questions, and so far only one person can answer most of them - the 19-year-old suspect in serious condition in a Boston hospital. Even the president has said he wants answers. Read the full story by CNN's Lateef Mungin.
[Update 6:14 a.m. ET] Life on the ice skates a step back towards normal Saturday in Boston, when the Pittsburgh Penguins will face the Boston Bruins in an NHL game at noon.
[Update 6:10 a.m. ET] Security officers still stand guard Saturday morning at the hospital, where "suspect number 2" is being treated.
[Update 5:05 a.m. ET] After a five-day nightmare, Boston can finally rest. One suspect in the Boston Marathon bombings is in custody. The other, his older brother, is dead. And residents across Massachusetts are cheering the officers who ended a week of hell. Read the story by CNN's Holly Yan.
[Update 3:48 a. m. ET] The government of Kazakhstan distanced itself from the Boston bombing suspects saying there is no evidence the brothers lived in the country before coming to the United States. The Kazakhs condemned the Boston attacks. The statement.
[Update 3:35 a.m.] BloombergBusinessweek reports: Shutting down Boston for a day cost $333 million.
[Update 3:33 a.m.] A flapping tarp ended a manhunt for the younger bombing suspect. When authorities lifted an order for residents to stay locked indoors, a man went for a stroll in his backyard and saw that something didn't look right about the tarp on his boat. Here's how it gave the suspect away.
[Update 3:31 a.m.] A photo tweeted by CNN affiliate WMUR reporter Jean Mackin shows "suspect number 2" through the window of an ambulance, as he is taken away from the scene in Watertown. His face can be seen on the lower left of the window.
[Update 2:55 a.m.] The family of the wife of one suspected bomber issued a typed statement that was published on a local news website in Rhode Island, The North Kingstown Patch. It read: "Our daughter has lost her husband today, the father of her child. We cannot begin to comprehend how this horrible tragedy occurred. In the aftermath of the Patriot's Day horror, we know that we never really knew Tamerlane Tsarnaev. Our hearts are sickened by the knowledge of the horror he has inflicted. Please respect our family's privacy in this difficult time."
See type written note here.
[Update 1:41 a.m.] The San Francisco Giants honored Boston victims by posting the message "#TogetherWereBoston" on the Jumbotron at AT&T Park during the team's game against the San Diego Padres.
[Update 1:10 a.m.] A powerful picture sent in by the Kafranbel Coordination Committee in the town of Kafranbel in northwest Syria.
[Update 12:45 a.m.] Montana Fredrick filmed students at Northeastern University celebrating in Hemenway Street on Friday night while first responders passed through. "Every time a police car passed by, the cheering became louder and a sense of respect and admiration was felt through the crowd," Fredrick said. "Many students donned American themed apparel with ample American flags dangling from windows and draped across students backs."
[Update 12:36 a.m.] Bassel Nasri, a friend of Dzokhar Tsarnaev, said the suspect never gave him a sense of being anti-American. The last time the two met was on April 8, the Monday before the Boston Marathon, when Tsarnaev gave him a ride to a soccer game. "He seemed very fine. It was just like regular conversation, talking about soccer," Nasri said.
[Update 12:16 a.m. ET] Tsarnaev is being evaluated and treated at Beth Israel Deaconess Medical Center where he remains in serious condition. There is a heavy police presence. The FBI is expected to offer an update on his condition sometime this morning.
[Updated at 12:12 a.m.] The family of 8-year-old Martin Richard, one of three killed in the Boston Marathon bombing, thanked law enforcement for the arrest but added: "None of this will bring our beloved Martin back, or reverse the injuries these men inflicted on our family and nearly two hundred others. We continue to pray for healing and for comfort on the long road that lies ahead for every victim and their loved ones."
[Posted at 12:02 a.m.] College students and Bostonians alike took to the Boston common to celebrate the arrest of the alleged Boston Marathon bombing suspect.