Dozens of people are believed to have been killed after a lorry ploughed into a Bastille Day crowd in Nice.
Footage showed crowds fleeing in terror from the scene in the French city on the Mediterranean coast on Thursday night.
Eyewitnesses reported hearing gunshots and pictures on social media showed armed police with weapons trained on a badly damaged white truck.
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Nice mayor Christian Estrosi, who was at the celebration when it happened, tweeted: "Dear people of Nice, the driver of a truck seems to have left dozens dead. Stay for now in your home. More info to come."