The famous Promenade des Anglais has been the scene of a horrific incident as upwards of 70 people have been confirmed dead, with many more injured.
French officials say that the truck driver drove two kilometres through a large crowd after many had filled the streets to celebrate Bastille Day.
There were reports of shots being exchanged between police and the occupants of the truck but nothing is yet confirmed.
Interior Ministry spokesman Pierre-Henry Brandet said that the driver has been “neutralised”.
“Everyone was calling run, run, run there’s an attack run, run, run. We heard some shots. We thought they were fireworks because it’s the 14th of July. One eyewitness told BFM TV:
“There was great panic. We were running too because we didn’t want to stick around and we went into a hotel to get to safety. ”
Another witness, Roy Calley told the BBC that there were “thousands of people on the promenade” when the incident happened.
Ongoing investigations will ascertain whether the driver was acting alone.