FILE - In this April 19, 2013 file photo, police in tactical gear surround an apartment building while looking for a suspect in the Boston Marathon bombings in Watertown, Mass. A Harvard University report released Thursday, April 3, 2014, on the response to the bombings was largely positive, but criticized law enforcement for the chaotic gunfight in which one suspect was killed and a police officer seriously injured, because it lacked coordination. (AP Photo/Charles Krupa, File)