Police believe Tsarnaev brothers killed officer for his gun
Tamerlan and Dzhokhar Tsarnaev only had one real gun and one pellet gun. Investigators believe because the officer's holster had a locking system, they apparently couldn't get the gun out.
Officer Sean Collier was shot in the head execution-style while sitting in his patrol car.
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It appears as if Dzhokhar Tsarnaev did not have a gun in the boat. So how did the shooting start there?
The issue goes to what the police were perceiving. One officer had the high ground and saw the tarp on the boat flip up and said he saw a hand come out with an object in it. He didn't think it was a gun, he thought Tsarnaev was about to throw another bomb. He fired a couple times.
Other officers who were just arriving, saw the tarp flip up and heard gun fire and apparently believed it was Tsarnaev firing out, so they laid down covering fire at that boat until the incident commander said cease fire.
http://www.cbsnews.com/8301-18563_162-57581048/police-believe-tsarnaev-brothers-killed-officer-for-his-gun/
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