"Suspect number one," the man shown in FBI-released video wearing the black baseball cap, died in a shoot-out with police earlier today. NBC is reporting that he died from multiple gunshot wounds and blast injuries. They're also reporting that he had an IED strapped to his chest.
At this time, law enforcement officials are conducting a block-by-block search, have advised resident to stay inside and keep doors locked and are asking businesses not to open.
Massachusetts State Police have announced that all public transportation service—buses and subways—have been "immediately suspended" and "no vehicle traffic is going to be allowed to travel in or out of Watertown until further notice."
Updates will be added as information becomes available.
3:30 AM PT: MSNBC is showing what appears to be a bomb squad on a Watertown street, apparently attempting to disarm or do a controlled blast of one of the explosive devices the suspects threw out of the car during the police chase early this morning.
3:32 AM PT: NBC's Pete Williams reports that the suspects may be from either Turkey or are Chechen refugees, that they have been in the U.S. for at least a year and are/were legal, permanent residents.
3:49 AM PT: NBC is reporting that the two suspects are brothers. The one still at large is apparently 19-years old and has a Massachusetts drivers license.
3:54 AM PT: The suspect who is still at large has been identified as Dzhokar Tsarnaev.