Mohammod Youssuf Abdulazeez

Vigilante guards — some associated with militia groups — have been appearing outside recruiting stations around the country, ostensibly to protect them in the wake of the Chattanooga shootings.

The bureau says it's treating Mohammod Youssuf Abdulazeez as a "homegrown violent extremist." Abdulazeez attacked two military facilities last week and killed five service members.

Investigators are examining writings believed to be by Mohammod Youssuf Abdulazeez. His attack on two military centers in Chattanooga, Tenn., killed five service members.

The statement from Mohammod Abdulazeez's family expresses "shock, horror, and grief" at the "heinous act of violence" that caused the deaths of five military service members

A spokeswoman for First Energy says he was dismissed for "not meeting minimum requirements for employment." Mohammod Youssuf Abdulazeez attacked two military centers Thursday and killed four Marines.

The word terrorism is a tricky one. That's because, as one linguist says, "terrorism itself, whatever that is" lives in a place between crime and war.

Mohammod Youssuf Abdulazeez, whom authorities have signaled as the man who shot and killed four Marines, is described by friends as funny, charming and devout.