restaurant at forted hood, a guy that wanted to nigh an explosive packed model airplane into the rafael benitez. a lot are caught by fbi stings, they get a whiff that someone wants to do something, they contact him and get the confidence. this guys, mohammod youssuf abdulazeez, he was not on an fbi radar. he was not someone that anyone was watching or expecting. he was a loan wolf that came out of the blue. >> for al jazeera, military affairs correspondent joint typhoon warning centre at the pentagon >>> next to the coverage in khairat el-shater -- chattanooga, protecting the protectors. obstacles at home. what motivates an attack like this. could anything in the alleged shooters's background identify anything behind the assault? we continue the coverage in the attack in chattanooga. investigators are looking into the shooter's background hoping to identify a motive for the assault. the trail so far has not revealed much. >> reporter: mohammod youssuf abdulazeez did have a previous encounter with chattanooga police, who released this mug shot of him from a dui arrest, but that was his only brus