People who fear their relatives may have become caught up in the Nice terror attack are being urged to use specially-dedicated social media channels to locate their loved ones.
It comes as France was rocked by an attack which saw 84 people killed after a large truck mowed through revelers gathered for Bastille Day fireworks.
The British Embassy in Paris has advised that UK citizens in the area follow the instructions of the French authorities. The embassy’s 24-hour number is +33144513100.
While no one has yet claimed responsibility for the attacks, President Francois Hollande addressed national television early on Friday morning, stating: “All of France is under the threat of Islamic terrorists.”
The truck plowed into the crowd over a distance 2km he said, and broadcast footage showed a scene of horror up and down the promenade.
Attack on Bastille Day celebration in Nice. If in the area follow instructions of French authorities. Our 24 hour number is +33144513100
French police forces and forensic officers stand next to a truck July 15, 2016 that ran into a crowd celebrating the Bastille Day national holiday in Nice, France.
Eric Gaillard / Reuters
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The truck which slammed into revelers.
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In this video grab taken Thursday July 14, 2016, ambulances and Police cars are seen after a truck drove on to the sidewalk.
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A policeman chases people out of the cordoned-off area.
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French soldiers stand guard.
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Police officers seal off the area.
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A police car is parked near the scene of the attack.
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Police officers secure the scene.
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Ambulances line up near the scene of the attack.
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Police officers and soldiers block the access to the scene.
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Eric Gaillard / Reuters
French police forces and forensic officers stand next to the truck.
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A forensic officer stands near a van with its windscreen riddled with bullets.
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A man runs near the scene of the attack.
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Bodies are seen on the ground.
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French soldiers cordon the area.
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Eric Gaillard / Reuters
Eric Gaillard / Reuters
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Eric Gaillard / Reuters
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A woman cries asking for her son as she walk near the scene of an attack.