Massachusetts Institute of Technology student Hajar Boughoula of Bizerte, Tunisia, writes a message on the ground with chalk near a makeshift memorial for fallen MIT police officer Sean Collier on the school's campus 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 Hajar Boughoula of Bizerte, Tunisia, writes a message on the ground with chalk near a makeshift memorial for fallen MIT police officer Sean Collier on the school's campus 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 Hajar Boughoula of Bizerte, Tunisia, writes a message on the ground with chalk near a makeshift memorial for fallen MIT police officer Sean Collier on the school's campus 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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