TIMELINE: Shootings, explosions in Mass.

A police secure an area near the Massachusetts Institute of Technology campus Friday, April 19, 2013, in Cambridge, Mass. State police say a campus police officer at the Massachusetts Institute of Technology has died from injuries in a shooting on the campus outside Boston. (AP Photo/Matt Rourke)
A police secure an area near the Massachusetts Institute of Technology campus Friday, April 19, 2013, in Cambridge, Mass. State police say a campus police officer at the Massachusetts Institute of Technology has died from injuries in a shooting on the campus outside Boston. (AP Photo/Matt Rourke)
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