WATERTOWN, Mass. (AP) -- Boston's police commissioner says all of Boston must stay in their homes as the search for the surviving suspect in the marathon bombings continues.
Boston Police Commissioner Ed Davis made the announcement Friday morning, after a long night of violence that left the other suspect dead.
The suspects were identified to The Associated Press as coming from the Russian region near Chechnya, which has been plagued by an Islamic insurgency stemming from separatist wars.
A law enforcement intelligence bulletin obtained by the AP identified the surviving suspect as Dzhokhar A. Tsarnaev, 19, of Cambridge, Mass.
The two men are suspected of killing a Massachusetts Institute of Technology police officer on campus in Cambridge late Thursday, then stealing a car at gunpoint and later releasing its driver unharmed.
The suspects' clashes with police began only a few hours after the FBI released photos and videos of the two young men, who were seen carrying backpacks as they mingled among revelers at Monday's Boston Marathon. The bombings on Monday killed three people and wounded more than 180 others, and authorities revealed the images to enlist the public's help finding the suspects.
A U.S. law enforcement official and the uncle of the suspects is confirming that the name of the second suspect is Tamerlan Tsarnaev, the older brother of Dzhokhar A. Tsarnaev.
He was killed in a gun battle with police.
Three law enforcement officials, speaking on condition of anonymity due to the sensitivity of the ongoing investigation, confirmed the bomb suspects were brothers. One of the officials and the men's uncle confirmed the identity of Tamerlan Tsarnaev.
The uncle, Ruslan Tsarni of Montgomery Village, Md., told The Associated Press that the men lived together near Boston and have been in the United States for about a decade. They traveled here together from the Russian region near Chechnya.
The father of the suspects claims that his son who is still on the loose is a smart and accomplished young man.
Anzor Tsarnaev spoke with The Associated Press by telephone from the Russian city of Makhachkala on Friday.
"My son is a true angel," the elder Tsarnaev said. "Dzhokhar is a second-year medical student in the U.S. He is such an intelligent boy. We expected him to come on holidays here."