Sorry, your browser is unable to play this video. Bastille Day attack witness: A truck smashed into everyone. Everyone
Maryam Violet, an Iranian journalist on holiday in the Mediterranean city, told the Guardian she had seen the truck running over people as they walked in the pedestrian area minutes after the fireworks finished. Everyone was completely shocked, I saw that suddenly people were fleeing and shouting, she said.
People were shouting, Its a terrorist attack, its a terrorist attack. It was clear that the driver was doing it deliberately, she said. I was walking for nearly a mile and that there were dead bodies over the place. I think over 30 dead bodies are on the ground and lots of people are injured. The dead bodies have been covered by blue sheets.
I saw two sisters and one brother from Poland that were mourning the death of their two other siblings.
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There were so many Muslim people who were victims because I could see they had scarves over their head and some were speaking Arabic, one family lost a mother and in Arabic, they were saying shes a martyr, she said. People were celebrating and it was so peaceful, it was a festive vibe, it was right after the fireworks that the truck came and ran over people.
Restaurant owners on the beachfront described sheltering panicked crowds who were fleeing and screaming.
A reporter for the French news agency Agence France-Presse described seeing a white vehicle driving at high speed on to the promenade.
We saw people hit and bits of debris flying around, he said, adding that the incident took place near the Hotel Negresco.
The French president, Franois Hollande, rushed back to the Paris government crisis centre from a visit to Avignon. Earlier he had given his traditional Bastille Day address saying that Frances state of emergency, in place since Novembers Paris attacks would end on 26 July.
Wassim Bouhlel, a Nice native who spoke to the Associated Press, said he had seen the truck drive into the crowd then witnessed the man emerge with a gun and start shooting. There was carnage on the road, Bouhlel said. Bodies everywhere.
It was not clear whether the driver had opened fire, or whether the gunfire heard by witnesses was part of police attempts to neutralise the driver.
A spokesman for the new UK prime minister, Theresa May, said she was being kept up to date on events, adding: Our thoughts are with all those affected by this terrible incident on what was a day of national celebration.
The White House said President Barack Obama was being kept updated. The president condemned what appears to be a horrific terrorist attack in Nice and said he had directed his team to offer any assistance
France may need in its investigation.
The Republican presidential candidate, Donald Trump, announced on Twitter that, after the events in Nice, he was delaying a press conference planned for Friday to announce his running mate.
He tweeted: Another horrific attack, this time in Nice, France. Many dead and injured. When will we learn? It is only getting worse.
The French ambassador to the US, Grard Araud, tweeted: Our democracies are besieged. Lets stick more than ever to our values. Libert, Egalit, Fraternit. Vive la France, vive les Etats-Unis.