Investigators piece together picture of Nice attacker

Bullet impacts are seen on the heavy truck the day after it ran into a crowd at high speed killing scores celebrating the Bastille Day July 14 national holiday on the Promenade des Anglais in Nice, France, July 15, 2016. - REUTERS

NICE, France: The driver of a truck who killed scores of people on the Nice seafront was a Tunisian petty criminal described by his father as a violent depressive and by neighbours as a loner who showed no outward sign of being a devout Muslim.

Investigators were on Friday piecing together a picture of the 31-year-old father of three who slammed into crowds who had been watching a Bastille Day fireworks display, killing 84 people including 10 children and adolescents.