A timeline of events related to the Boston Marathon bombing, which killed three people and injured 260 others on April 15, 2013:March 2011: The Russian FSB intelligence security service gives the FBI information that Tamerlan Tsarnaev, who lives in Cambridge, Massachusetts, with his family, was a follower of radical Islam.June 2011: The FBI closes the investigation after finding nothing to link Tsarnaev to terrorism.Sept. 12, 2011: The bodies of three men are found in Waltham, Massachusetts, with their throats slit and marijuana sprinkled on them.