Boston Marathon Bombers: One Suspect Dead, One At Large, Boston Locked Down [UPDATED]

• One suspect is dead; the other is currently at large, believed to still be in the Boston area, probably in the suburb of Watertown, Massachusetts.
• Watertown is completely shut down, as is Boston in general.
• No trains (either the T or Amtrak), buses or taxis are in service. Streets are closed off.
• Law enforcement is going door-to-door in search of the remaining suspect, whom they believe is armed and dangerous.
• Police have asked all residents to stay in their homes, lock the doors, and only open them for police who present ID.

The two suspects are brothers. One, 26-year-old Tamerlan Tsarnaev, was shot and wounded during a battle with a police in Cambridge late Thursday night. He was taken to the hospital and pronounced dead at 1:35 a.m.

Currently more than 9,000 law enforcement officers of various levels—local police, FBI, counterterrorism agents, Homeland Security—are searching house by house for the remaining suspect, 19-year-old Dzhokhar Tsarnaev of Cambridge.

On Wednesday night, the brothers were on the campus of MIT, where they shot and killed a campus security officer named Sean Collier, 26, of Somerville. Then, at about 10:30 p.m., they carjacked a Mercedes SUV, taking the driver hostage. They later released him, unharmed, and drove to Watertown, where police engaged them.

It was during this fight that the older brother was shot and mortally wounded. The younger brother then escaped somewhere in Watertown, which is where the manhunt is currently focused.

The suspects' uncle, Ruslan Tsarni, spoke with reporters. He said the boys came to America about 10 years ago. The A.P. had reported earlier that they brothers were from Chechnya.

They both went to high school in Cambridge, where by all accounts so far, they were normal teenagers. Tamerlan, the older brother, was a fairly successful boxer. Dzhokhar was a wrestler, and he had even earned a scholarship to the University of Massachusetts-Dartmouth.

If you have any information, call 1-800-CALL-FBI.

[CBS, Boston Globe, TPM, CBS-Boston]