One police officer is dead and two others wounded after a shooting incident in the center of Paris.
Police evacuated the Champs Elysees, one of the city's busiest thoroughfares, after a police car came under fire.
One attacker was killed at the scene.
Police have now issued an arrest warrant for a second attacker who reportedly arrived in France by train from Belgium.
President Francois Hollande has chaired an emergency of his Cabinet, just three days before the first round of the French Presidential election.
The dead gunman was reportedly known to the authorities.
Reporter Peter Allen is in Paris.
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In Washington, President Trump reacted to news of the attack.
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