From Boston.com live blog:
State Police released a summary of the events that led to the death of bombing suspect Tamerlan Tsarnaev and the closing of metro Boston communities as law enforcement searched for his younger brother.
Police said the first indication of trouble was 10:24 p.m. when MIT police received a call from someone reporting they had heard what they thought were gunshots. Four minutes later, the 7-11 store at 750 Mass. Ave. was hit by an armed robber, but that crime was not committed by the brothers, State Police now say.
One minute later, however, authorities allege that the brothers did shoot and kill MIT police officer Sean A. Collier as the officer sat in his MIT cruiser.
Two minutes later, authorities received a call that a car had been carjacked by two men outside 816y Memorial Drive. A short time later – it was not immediately clear how long – an MBTA police officer spotted the vehicle and pursued, a chase that came to a stop in Watertown.
In the moments that followed, 200 rounds of ammunition were fired by police and apparently by the brothers. Police also recovered lots of evidence, including pieces of homemade explosives, including pipe bombs and another pressure cooker,"’ State Police said.
Also, contrary to what authorities said earlier today, no potential explosives were found on Norfolk Street in Cambridge where the two brothers lived, and a planned "controlled explosion"’ was deemed unnecessary.
"We thought a car there might have an explosive, but it did not," State Police spokesman David Procopio said in the statement.
