PARIS — An armed man was killed in Paris on Monday afternoon after he rammed a car into a police convoy on the Champs-Élysées, the French authorities said.

A convoy of vans belonging to the gendarmerie, one of France’s police forces, was traveling on the Champs-Élysées around 3:40 p.m. when a man drove up in a Renault Mégane and struck the lead vehicle, said Johanna Primevert, a spokeswoman for the Paris police prefecture. The Renault caught on fire.

Ms. Primevert said no bystanders had been injured. Gérard Collomb, the interior minister, said the assailant had died; he did not specify the cause.

“This car contained a certain number of weapons and explosives, making it potentially possible to blow the car up,” Mr. Collomb said, but he did not provide details on what kinds of explosives or weapons were found.