. >> reporter: local police and fbi, desperate for clues, are scouring his home in nearby hixon, tennessee. in a silver mustang he abandoned at the scene. authorities are also investigating if abdulazeez was inspired by isis or another terrorist organization. >> it is a huge concern. it probably is the biggest concern to law enforcement as far as terrorism is concerned day to day in the united states. >> reporter: as recently as this last weekend, and going back a year isis has been urging its followers in the u.s. to attack uniformed police and military in this country. the group posted photos and home addresses of more than 100 active-duty soldiers saying what are you waiting for? kill them in their own land. >> we are increasingly saying individuals who may be motivated by the ideology of a terrorist group, may be inspired by their social media campaigns, but are acting independent of those terrorist organizations. and that is not a threat that our intelligence capabilities, as robust as they are, our counterterrorism capabilities as robust as they are, were designed to address. >> repo