The FBI says it's too early to tell whether Mohammod Youssuf Abdulazeez was radicalized before he attacked two military facilities in Chattanooga, Tenn., and killed five service members.
"This is a complex, ongoing investigation, and we're still in the early stages of piecing together exactly what happened and why," FBI Special Agent in Charge Ed Reinhold said Wednesday at a news conference.
Reinhold said between 700 and 1,000 agents are working full time on the investigation into what led the Kuwaiti-born Abdulazeez, 24, to carry out last week's attacks.