UPDATE 4/19 07:54am

A U.S. law enforcement official and the uncle of the suspects in the Boston Marathon bombings are confirming that the name of the second suspect is Tamerlan Tsarnaev, the older brother of Dzhokhar A. Tsarnaev, 19. Tamerlan Tsarnaev was killed in a gun battle with police in Massachusetts overnight.

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.

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Police are locking down some neighborhoods in Boston and its western suburbs as they search for the remaining suspect in the marathon bombings.

Authorities urged residents in Watertown, Newton, Waltham, Belmont, Cambridge, Arlington and the Allston-Brighton neighborhoods of Boston to stay indoors. All mass transit was shut down.

At least a quarter of a million people live in those suburbs. Many people in the city of Boston and surrounding areas rely on the Massachusetts Bay Transit Authority to get to work.

The announcement Friday morning comes hours after the killing of one suspect, known as the man in the black hat from marathon surveillance footage. The man in the white hat is on the loose and police are calling him a “terrorist” who came here “to kill.”