Local police say least four people were wounded -- two severely and two with minor injuries -- and at least one victim was killed in the attack.
Video posted to social media showed police surrounding a man lying on the ground as bystanders in the area frantically fled the scene.
Interior Minister Gerard Collomb denounced the "odious attack" on Twitter and applauded police for quickly "neutralizing the attacker."
This story is developing. Please check back for updates.