Authorities have surrounded a boat where the second Boston Marathon suspect, Dzhokhar Tsarnaev, is reported to be hidden. Radio silence on the police scanner indicates an operation has begun.
Details are sketchy at this point, but what is clear is that many shots have been fired, and uniformed police have been ordered to evacuate the area as tactical teams move in. The FBI's Hostage Rescue Team, generally considered the most elite anti-terrorist police team in the country, is there and moving in on the scene. K-9 units, as well as a robotic tank appear to have been requisitioned.
The situation is unfolding slowly, as authorities appear to be taking their time to avoid unnecessary casualties. It appears, however, that the incident may be at an end.