A gunman at the wheel of a heavy truck ploughed into a crowd celebrating Bastille Day in the French city of Nice on Thursday (July 14), killing at least 84 people and injuring scores more in what President Francois Hollande called a terrorist act.

The attacker, identified by a police source as a 31-year-old Tunisian-born Frenchman, also opened fire before police shot him dead. He had been known to the police for common crimes but not to the intelligence services, the source said.