Cars and trucks were barred from the Promenade des Anglais during Thursday’s Bastille Day festivities, but the terrorist who plowed a 19-ton truck into a mile-long crowd of revelers – killing at least 84 – reportedly got past police by telling them he had ice cream to hand out.

Mohamed Lahouaiej Bouhlel, a 31-year-old divorced loner, petty criminal and Tunisian national began his route of carnage by slowly moving onto the packed, seaside walkway around 10:40 p.m. local time. Then, say witnesses, he gunned the engine and weaved through the horrified crowd for nearly a mile, leaving a wake of dead and broken bodies. Police killed him in a shootout minutes later.

“Such a monstrosity,” French President Francois Hollande said Friday. “France is deeply saddened, but it is also very strong. I can assure you we will always be stronger than the fanatics who are trying to attack us.”

There was no immediate claim of responsibility, but two sources, including a U.S. counterterrorism source who collects and monitors jihadist social media, told Fox News that accounts linked to ISIS were “celebratory” and their followers were told to use the hashtag “Nice.”