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This is the horrifying moment a truck ploughs into a crowd of screaming revellers killing dozens on Bastille Day.

A scene of devastation was left on the sea front in Nice after what is believed to have been a terror attack.

Bloodied bodies were left strewn across the street in scenes of horror.

According to witnesses, a lorry driver ploughed into revellers along

the Promenade des Anglais in Nice, southern France.

A British mum has told how she and her young family fled in terror after a truck ploughed into a crowd of Bastille Day revellers in the French city of Nice.

(Image: AFP/Getty)

Harjit Sarang, 42, a surrogacy lawyer from London, was in the city with her husband and two young sons, aged six and nine.

She has told the Mirror of the panic immediately after the incident as crowds rushed through the streets away from the main promenade.

She said: "We were told about the fireworks by someone in the hotel and decided to go along."I was going to leave my husband to take the boys because I was so tired but I'm so glad I didn't now."

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The fireworks had just finished and we were walking just off the main promenade when we saw people running and screaming through the streets.

"It was just sheer panic and with the volume of people it was a crowd mentality.

(Image: @harp_detectives)

"We just started running, it was so difficult to stay together and to stay calm, especially with two small boys. We just ran, we panicked, not even knowing in which direction our hotel was.

"My eldest son was yelling at us, 'why have you brought me here, I'm never coming here again.'

"The worst thing is thinking we took our children into that.

"The family arrived in the city by train from Monaco today and are due to fly home tomorrow.'

(Image: @harp_detectives) (Image: AFP/Getty)

A video posted on Twitter show terrified people rushing away from the scene of the incident.

Another clip shows panicked crowds, including a woman with a push chair, dashing for safety and falling over each other in their bid to escape.

There are also reports of gun shots - but as a firework display was part of the celebrations these are unconfirmed.

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The Promenade des Anglais is a celebrated walkway along the Mediterranean that extends from the airport on the west to the Quai des États-Unis on the east, a distance of approximately 4 miles.

There are also reports of gun shots - but as a firework display was part of the celebrations these are unconfirmed.

The mayor of Nice has warned people in the city to stay inside.

Christian Estrosi wrote in French on Twitter: "Dear Nice, the driver of a truck seems to have left dozens dead.

"Stay in your homes for now. More info to come."

The Promenade des Anglais is a celebrated walkway along the Mediterranean that extends from the airport on the west to the Quai des États-Unis on the east, a distance of approximately 4 miles.