the driver has been identified as 31-year-old mohamed lahouaiej bouhelel.terrorist was known to authorities for petty crimes but wasn't on the radar of counter terrorism negotiators. >> he was entirely unknown by the intelligence services. he had never been the subject of any kind of file or indication of radicalization. >> reporter: authorities are combing through the suspect's house where he lived alone, a neighbor described him as odd. he wouldn't say hello, only nod his head. the attacker's ex-wife was taken into custody and is being questioned by police. together they had three children. investigators are trying to figure out if the assailant acted alone or had help and there have been no claims of responsibility for the attack by any group so far. the horrific scene unfolded around 10:30 p.m. thursday night. thousands were gathered to watch fireworks celebrating french independence day. as the fireworks were ending and revelers began walking back along the promenade, the attacker first opened fire on the crowd from inside of the rented 18 ton refriger