Boston is the scene of more tragedy tonight. A <s>Massachusetts state trooper</s> campus police officer was shot and killed on the campus of MIT. Early news reports are calling it a “robbery gone wrong.”

The shooter is apparently still on the loose.

Photos on campus:

Twitchy will update as the search continues.

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Update:

Watertown carjacking follows MIT shooting, police chase, explosions [pics]

Update:

The slain officer has been identified as 26-year-old Sean Collier:

R.I.P.

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