Massachusetts Institute of Technology student Tanya Todorova, of Haskovo, Bulgaria, left, links arms with others to form a human chain from a makeshift memorial for fallen MIT police officer Sean Collier to a campus police station, at MIT, in Cambridge, Mass., Monday, April 22, 2013. Collier was fatally shot on the MIT campus Thursday, April 18, 2013. Authorities allege that Boston Marathon bombing suspects Tamerlan and Dzhokhar Tsarnaev were responsible. (AP Photo/Steven Senne)

Associated Press
Massachusetts Institute of Technology student Tanya Todorova, of Haskovo, Bulgaria, left, links arms with others to form a human chain from a makeshift memorial for fallen MIT police officer Sean Collier to a campus police station, at MIT, in Cambridge, Mass., Monday, April 22, 2013. Collier was fatally shot on the MIT campus Thursday, April 18, 2013. Authorities allege that Boston Marathon bombing suspects Tamerlan and Dzhokhar Tsarnaev were responsible. (AP Photo/Steven Senne)
Massachusetts Institute of Technology student Tanya Todorova, of Haskovo, Bulgaria, left, links arms with others to form a human chain from a makeshift memorial for fallen MIT police officer Sean Collier to a campus police station, at MIT, in Cambridge, Mass., Monday, April 22, 2013. Collier was fatally shot on the MIT campus Thursday, April 18, 2013. Authorities allege that Boston Marathon bombing suspects Tamerlan and Dzhokhar Tsarnaev were responsible. (AP Photo/Steven Senne)
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