Boston bomber apologizes

Boston Marathon bomber Dzhokhar Tsarnaev on Wednesday apologized for the deadly 2013 attack at a hearing, and a U.S. judge formally sentenced him to death for killing four people and injuring 264 in the bombing and its aftermath.

"I am sorry for the lives I have taken, for the suffering that I have caused you, for the damage I have done, irreparable damage," Tsarnaev, 21, told a courtroom packed with parents of some of the dead and some of those wounded on April 15, 2013.

It was the first time that Tsarnaev, who did not speak in his own defense during his trial, had addressed the court.

"In case there is any doubt, I am guilty of this attack, along with my brother," Tsarnaev said, standing at the defense table.