BOSTON - More is emerging about the criminal case against the surviving suspect in the Boston Marathon bombings.
U.S. officials say Dzhokhar Tsarnaev and his brother appear to have been motivated by their religious faith, not any connection to any Muslim terrorist groups.
The officials made the assessment after Tsarnaev was interrogated in his hospital room, where he's being treated for severe wounds allegedly suffered during violent encounters with law enforcement following the Boston Marathon bombings.
He was charged today with federal crimes that could bring the death penalty, including 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 200 a week ago.
The brothers, ethnic Chechens from Russia who had been living in the U.S. for about a decade, practiced Islam.
The surviving brother is said to have communicated with his interrogators in writing because of throat wounds.
CNN reports that Tsarnaev communicated to investigators that he and his brother acted alone and that no international terror groups were behind the Boston attacks. He also said that his brother was the driving force behind the attacks.
Officials say what he said will have to be verified. Investigators will look at such things as his telephone and online communications and his associations with others.
(Copyright 2013 The Associated Press. All rights reserved. This material may not be published, broadcast, rewritten or redistributed.)