Terrorist or extremist, was Abdulazeez a man with a plan?

FBI Special Agent in Charge Ed Reinhold of the Knoxville Field Office speaks during a Wednesday news conference in the auditorium of the TVA Office Complex in Chattanooga. Assistant Commissioner David Purkey from the Tennessee Department of Safety and Homeland Security stands at his left.

The FBI is not calling Mohammad Youssef Abdulazeez a terrorist - not yet, at least.

Officials, for now, are labeling him something else. The words used at a news conference Wednesday were more nuanced.

"He is being treated as a homegrown violent extremist," said FBI Special Agent Ed Reinhold.

Terrorists, by definition, are killers with an ideological agenda, experts say. They intend for their violence to send shock waves, to strike fear and influence policy.

Yet, so much is still unknown about Abdulazeez's intent, although it is clear his faith played a significant role in his decision to arm himself, fire into a military recruitment center and then ram into a military base and kill five service members.