French interior minister Bernard Cazeneuve says that the truck driver who killed 84 people when he careened into a crowd at a fireworks in Nice show was "radicalized very quickly," the Associated Press reports.

Speaking to journalists at the Elysee Palace in Paris, Cazeneuve said Saturday, July 16 that the case demonstrated the "extreme difficulty of the fight against terrorism."

The French government has been criticized for lax security at the show, which marked Bastille Day, France's national holiday. But Cazeneuve said that high security had been assured in the region — including at the Cannes Film Festival and the Nice Carnival.