BOSTON - The two brothers suspected of bombing the Boston Marathon appear to have been motivated by their religious faith but do not seem connected to any Muslim terrorist groups, U.S. officials said Monday after interrogating the severely wounded younger man. He was charged with federal crimes that could bring the death penalty.
Dzhokhar Tsarnaev, 19, was charged in his hospital room with using a weapon of mass destruction to kill. He was accused of joining with his older brother, Tamerlan - now dead - in setting off the pressure-cooker bombs that killed three people and wounded more than 180 a week ago.
The brothers, ethnic Chechens from Russia who had been living in the U.S. for about a decade, practiced Islam.
Dzhokhar Tsarnaev communicated with his interrogators in writing, a less-than-ideal format that precluded the type of detailed back-and-forth crucial to establishing the facts, said one of two officials who recounted the questioning. They spoke on condition of anonymity because they were not authorized to publicly discuss the investigation.
The two officials said the preliminary evidence from an interrogation suggests the Tsarnaev brothers were driven by religion but had no ties to Islamic terrorist organizations.
At the same time, they cautioned that they were still trying to verify what they were told by Dzhokhar Tsarnaev and were looking at such things as his telephone, online communications and his associations with others.
The criminal complaint containing the charges against Dzhokhar Tsarnaev shed no light on the motive.
But it gave a detailed sequence of events and cited surveillance-camera images of him dropping off a knapsack with one of the bombs and using a cellphone, perhaps to coordinate or detonate the blasts.
The Massachusetts college student was listed in serious but stable condition at Beth Israel Deaconess Medical Center with a gunshot wound to the throat and other injuries. His 26-year-old brother died last week in a gunbattle with police.
"Although our investigation is ongoing, today's charges bring a successful end to a tragic week for the city of Boston and for our country," Attorney General Eric Holder said in a statement.
The charges carry the death penalty or up to life in prison.
"He has what's coming to him," a wounded Kaitlynn Cates said from her hospital room. She was at the finish line when the first blast knocked her off her feet, and she suffered an injury to her lower leg.
In outlining the evidence against him in court papers, the FBI said Tsarnaev was seen on surveillance cameras putting a knapsack down on the ground near the site of the second blast and then manipulating a cellphone and lifting it to his ear.
Seconds later, the first explosion went off about a block down the street, spreading fear and confusion through the crowd. But Tsarnaev - unlike nearly everyone around him - looked calm and quickly walked away, the FBI said.
Just 10 seconds or so later, the second blast detonated at the site where he had left the knapsack, the FBI said.
The FBI did not make it clear whether authorities believe he used his cellphone to detonate one or both of the bombs or whether he was talking to someone.
The court papers also said that during the long night of crime Thursday and Friday that led to the older brother's death and the younger one's capture, one of the Tsarnaev brothers told a carjacking victim: "Did you hear about the Boston explosion? I did that."
In addition to the federal charges, the younger Tsarnaev brother is also likely to face state charges in connection with the shooting death of an MIT police officer on Thursday.
The Obama administration said it had no choice but to prosecute Tsarnaev in the federal court system. Some politicians had suggested he be tried as an enemy combatant in front of a military tribunal, where defendants are denied some of the usual U.S. constitutional protections.
But Tsarnaev is a naturalized U.S. citizen, and under U.S. law, American citizens cannot be tried by military tribunals, White House spokesman Jay Carney said. Carney said that since 9/11, the federal court system has been used to convict and imprison hundreds of terrorists.
In its criminal complaint, the FBI said it searched Tsarnaev's dorm room at the University of Massachusetts-Dartmouth on Sunday and found BBs as well as a white hat and dark jacket that look like those worn by one of one of the suspected bombers in the surveillance photos the FBI released a few days after the attack.
Seven days after the bombings, meanwhile, Boston was bustling Monday, with runners hitting the pavement, children walking to school and enough cars clogging the streets to make the morning commute feel almost normal.
Residents paused to observe a moment of silence at 2:50 p.m., the time of the first blast.
Church bells tolled across the city and state in tribute to the victims.
Standing on the steps of the state Capitol, Massachusetts Gov. Deval Patrick bowed his head and said after the moment of silence: "God bless the people of Massachusetts. Boston Strong."
On Boylston Street, where the bombing took place, the silence was broken when a Boston police officer pumped his fists in the air and the crowd erupted in applause. The crowd then quietly sang "God Bless America."
Also on Monday, hundreds of family members and friends packed a church in Medford for the funeral of bombing victim Krystle Campbell, a 29-year-old restaurant worker.
A memorial service was scheduled for Monday night at Boston University for 23-year-old Lu Lingzi, a graduate student from China.
Fifty-one victims remained hospitalized Monday, three of them in critical condition.
On StarNet: View photos of the Boston Marathon bombings aftermath at azstarnet.com/gallery
Read more about the Boston bombings. Page A11
Officials: Bomb suspects appear driven by faith. Page A11
"Did you hear about the Boston explosion? I did that."
one of the Tsarnaev brothers to a carjacking victim