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Apparently a campus security officer has been shot (no mention of h) and the campus is locked down. The campus is also very close to the site of bombing on Monday but its not clear if there is any relation.

http://boston.cbslocal.com/2013/04/18/shooting-reported-on-mit-campus/

http://emergency.mit.edu/

The officer is dead and they have not found the gunman yet. This happened about two miles from where the bombing happened.