Two shots were fired into the air at the Cannes film festival while a crowd watched a live TV interview with actors Christoph Waltz and Daniel Auteuil.
A suspect was promptly arrested, Reuters reports. Police said he was carrying a dummy grenade, knife and starting pistol.
"The bodyguards jumped over the barriers into the crowd and pulled him to the ground. The police arrived and told everyone to run because there was a grenade in his hand," witness Arthur Laiguesse told Reuters...
"It really appears to be a crazy guy," said a police source.
The French station Canal+ continued rolling throughout the incident.
Jessica Testa is a national reporter for BuzzFeed News and is based in New York.
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