Ibragim Todashev, the Chechen acquaintance of one of the accused Boston bombers, was shot roughly half a dozen times in several seconds by an FBI agent after he twice lunged at the officer with a metal stick, according to senior federal law enforcement officials.

The description of events follows a series of unofficial and contradictory accounts that surfaced after the shooting in Todashev's Orlando apartment May 22, including early reports — later said to be inaccurate — that he attacked the agent with a knife.