A French policeman was stabbed to the back by a man wielding a knife on Friday, but he was able to fight off the assailant, who then died from his wounds, a police spokesman said.
The man was arrested in the early hours of Friday, and was being questioned by police, spokesman Patrick Bourque said.
He died at the scene.
The policeman, who was wearing a blue shirt, had been working in the French capital for the past two years and was serving in the military, the spokesman said in a statement.
France has had a series of deadly attacks, including the Nov. 13 assault on a satirical newspaper in Paris, and the November 15 massacre at a Paris Jewish museum that left 12 dead.
French President Emmanuel Macron said at a news conference Friday that he would seek to “cleanse” the country of “the scourge of terrorism”.
The French capital has been on heightened security measures following the Nov, 13, attack, which left 12 people dead and hundreds wounded.