Watertown, MA (Sports Network) - One suspect in the Boston Marathon bombings was killed early Friday morning, while the second suspect is still at large.
The two individuals are brothers believed to be from a Russian region near Chechnya, with the suspect on the loose identified as Dzhokhar Tsarnaev. He is 19 years old.
Tamerlan Tsarnaev, the suspect wearing a dark hat in photos released by the FBI on Thursday, was killed in a gun battle with police overnight.
The manhunt for the suspect seen wearing a white baseball cap in photos from Monday's bombings has led to the shutdown of the MBTA's entire network of commuter rail, bus, and subway services.
State authorities also asked people who live in Watertown, Waltham, Newton, Belmont, Cambridge, and Allston-Brighton to stay home and for businesses in those cities and towns to remain closed.
Authorities said surveillance tape recorded later Thursday showed Dzhokhar Tsarnaev during a robbery of a convenience store in Cambridge, near the campus of MIT, where a university police officer was killed.
The two bombing suspects then carjacked a man and were chased into Watertown. During the pursuit, the suspects threw explosive devices from the car and exchanged gunfire with police.