Ibragim Todashev "just went crazy," and pulled a knife during his interview with the FBI, said state and federal law enforcement officials briefed on the latest strange twist in the investigation of the Boston Marathon bombing.
One official said an FBI agent was stabbed several times, although his injuries were described by the FBI as "non-life threatening."
FBI agents and Massachusetts state police began to question Todashev after his name and phone number were recovered from the phone of the dead bombing suspect. Tamerlan Tsarnaev was killed in a shootout with police days after he and his younger brother Dzhokhar allegedly planted two bombs near the finish line at the Boston Marathon April 15, killing three and injuring more than 260 others. Dzhokhar was later captured and is in custody.