An eyewitness to the Nice attack has said he saw a truck driver slam a vehicle into a crowd of revellers and then emerge from the vehicle shooting.

Wassim Bouhlel said: "There was carnage on the road. Bodies everywhere."

More than 80 people were killed along the city's famed Promenade des Anglais.

The French president said the atrocity was "undeniably" an act of terror.

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A local official has been quoted as saying the driver travelled at high speed for more than a mile along the seafront before hitting spectators celebrating Bastille Day, a national holiday in France.

Hundreds of terrified people ran to try to escape, with the seaside path left strewn with fallen bodies after the carnage ended.

Image: People put their hands on their heads as a soldier secures the area

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The driver of the truck has been shot dead and an anti-terror investigation has been launched.

One witness told i-Tele: "We almost died. It was like hallucinating... (the lorry) zigzagged - you had no idea where it was going.

"My wife ... a metre away ... she was dead.

"The lorry ripped through everything ... poles, trees.

"We have never seen anything like it. Some people were hanging on the door and tried to stop it."

Attack Scene Full Of Holidaymakers

A reporter for the AFP news agency described the scene as "absolute chaos", adding: "We saw people hit and bits of debris flying around. I had to protect my face from flying debris."

:: History of Deadly Attacks In France

He added: "For a big truck like that to get actually onto the promenade and then to go in a fairly straight line along there, looked to me like a very deliberate act.

"It was about 100 metres from me and I had a few seconds to get out of the way."

Police could be seen surrounding the truck, its windscreen riddled with bullet holes, under the light of the Negresco Hotel in the aftermath of the attack, which has become a makeshift hospital.

'People Were Screaming On Streets'

The president of the region that includes Nice said the vehicle was loaded with arms and grenades.

Christian Estrosi told BFM TV that "the driver fired on the crowd, according to the police who killed him".

Witness Tony Molina watched the chaos unfold from his hotel room on the promenade.

He told CNN: "There was still a crowd of people and then you just see this big white panel truck, I couldn't see the driver, but it just kept going at different angles from left to right at 25 to 30 miles and hour.

"People were screaming and running.

"There are still people I am looking at right now that are near their deceased family members.

Image: Bodies on a street after the deadly attack in Nice Image: The horrific scenes unfolded during Bastille Day celebrations Image: Picture from @Nice_Matin Twitter account showing the damaged truck in the aftermath Image: A major security operation is under way on the streets of Nice Image: French soldiers and police secure the area Image: Witnesses described chaotic scenes Image: People were filmed running from the area Image: More people running for their lives Image: Troops on a street in Nice Image: Image from @Nice_Matin showing emergency services personnel at the scene Image: Picture from Nice-Matin's Twitter account showing the aftermath Image: French President Francois Hollande leads an emergency meeting in Paris /

"I work in homicide and I've never seen anything like this. It's unbelievable."

Nice Matin journalist Damien Allemand, who was at the waterside, said the display had finished and the crowd had got up to leave when they heard a noise and cries.

"A fraction of a second later, an enormous white truck came along at a crazy speed, turning the wheel to mow down the maximum number of people," he said.

"I saw bodies flying like bowling pins along its route. (I) Heard noises, cries that I will never forget."

Sylvie Toffin, a local authority press officer, said the lorry "hit several people on a long trip" down the pavement.

Image: The seaside path where the attack happened was strewn with bodies

Ms Toffin said that "to my knowledge" there was no gunfire and that the incident was deliberate.

"It's an attack," she said, adding she did not have casualty figures.

One woman told France Info she and others had fled in terror.

"The lorry came zig-zagging along the street," she said.

"We ran into a hotel and hid in the toilets with lots of people."