At least 80 people have been killed when a truck plowed into a crowd celebrating Bastille Day in the city of Nice, in southern France. French President Francois Hollande said the attack had a "terrorist nature."

French President Francois Hollande on Friday said the "terrorist nature" of an attack in Nice is undeniable after a driver rammed a truck into a crowd of revelers on Bastille Day, killing dozens of people, including children.

"All of France is under the threat of Islamist terrorism. We must show constant constant vigilance," Hollande said in a statement.

French Interior Minister Bernard Cazeneuve said 80 people were killed and dozens injured in the attack.

Regional President Christian Estrosi told BMFTV that the truck was filled firearms and grenades. "There were guns in this vehicle and larger weapons, but I can't say more than that because that is the prosecutor's job," Estrosi said.

Sebastien Humbert, the sub-prefect of the Alpes-Maritimes region, told the French television channel that the "truck rammed into the crowd over a long distance, which explains this extremely heavy toll."

"This is the worst tragedy in the history of Nice, with more than 70 victims already reported," the regional president said earlier in the evening.

Hollande confirmed that security forces killed the driver. Witnesses also described hearing gunfire. However, authorities have yet to confirm reports of weapons being used in the attack.

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