Paris police

French Interior Minister Gérald Darmanin ordered the probe, saying such gatherings, breaching Covid lockdown rules, would be "totally unacceptable".

A private TV channel, M6, tweeted the undercover film, with the description "caviar, champagne, top chefs' menus and no masks allowed".

France is now in its third lockdown.

More than 2,000 people marched Saturday in Bobigny, a suburban town nearly six miles (9.2 kilometers) northeast of the French capital. They chanted and carried signs demanding justice for a 22-year-old man who says he was sodomized by a police officer's baton.

The demonstrations turned violent when a few hundred protesters broke away from the march and began rioting, police said. They smashed windows, set cars and trash cans on fire and attacked law enforcement personnel, who responded by firing tear gas into the crowd.