mohammad youssuf abdulazeez was armed with a military-style rifle and several 30 round magazines. police say he was a u.s. citizen, naturalized, born in kuwait and his friends say abdulazeez recently spent a couple of years outside the u.s. in jordan or perhaps even yemen. abdulazeez held officers at bay with his weapon for a time after shooting up the military center, but police eventually moved in and shot him dead. and then look at this sign posted on the door of the chattanooga mosque attended by abdulazeez. the mosque has canceled all activities surrounding this weeke weekend's muslim holiday. cnn's victor blackwell is in chattanooga for us right now. victor, tell us where the investigation stands. any more about what may have driven this man to start shooting like this? >> fredricka, you mentioned the four who were killed. in addition there are several