At least 80 are reportedly dead after a lorry crashed in a crowd of people celebrating Bastille Day in southern France.
Hundreds were seen fleeing the scene after the vehicle careered into people who had gathered to celebrate the country’s official independence day.
Eyewitnesses report seeing the driver climbing out of the car following the crash and shooting at bystanders, killing many more.
The attack happened on the Promenade des Anglais at around 10:30pm local time during a firework display in what local officials are treating as an attack, French media has said.
Nice’s mayor Christian Estrosi has tweeted “tens of people” had been killed in the crash and urged people to stay indoors.
There have also reportedly been exchanges of gunfire between the driver and the police. The truck was reportedly seen “riddled with bullets” and the driver is dead.
One witness, Colin Srivastava, said: “The police told us run, now!”
Another, Roy Calley, told the BBC shots between the driver and police were fired as soon as they began to approach.
A student at the celebration told local newspaper Nice Matin: “We were at Neptune Beach and the fireworks ended so we started to head back.
“At that moment we saw the white lorry. It was around six tonnes and going at around 60-70km per hour.
“I saw behind the wheel. The driver was decided on where he was going. It happened two metres from us. I saw people lying, I saw a child on the ground”.
Facebook has activated its security check service for people in the area to let people inform there families and friends.
One image on Twitter shows dozens of people lying injured on the floor with another showing a white lorry stopped in the middle of the street with four police officers observing it from a nearby palm tree.
It comes just hours after French president Francois Hollande announced the state of emergency which had been in place since the Paris attack in November would be lifted on 26 July.
He has now said he will be returning to Paris from holiday in Avignon following the incident.