The mayor of Nice is calling for France to step up its fight against extremism, saying the attack on his city shows that radical ideas are still entering the country too easily.

At least 84 people died and hundreds more were wounded when Tunisian-born Mohamed Lahouaiej Behloul drove a truck through Bastille Day crowds on Thursday.

Nice mayor Philippe Pradal warned Monday that France has some way to go in preventing extremists from launching similar attacks on its territory.

Pradal told The Associated Press in an interview that "we haven't necessarily learned all of the lessons from the fact that our country is at war."

He said the fight against extremists wouldn't be won "with the tools of peace."