At least 84 people have died, including children, after a lorry slammed through a crowd celebrating Bastille Day in the southern French city of Nice.
The driver ploughed on for 2km (1.2 miles) on the Promenade des Anglais at about 23:00 local time, before being shot dead by police.
Witnesses say the speeding lorry swerved and zigzagged in an apparent attempt to hit more people.
Police reportedly found guns and grenades inside the lorry.
President Francois Hollande, who has now arrived in Nice, said the attack was of “an undeniable terrorist nature”.
A state of emergency, in place since November’s Paris attacks carried out by militants from the so-called Islamic State group, in which 130 people died, has been extended by three months.
Warning: This story contains images some people may find distressing
The attack in Nice began shortly after the end of a firework display on the seafront for Bastille Day, which is the country’s national holiday.
Images from the French city of Nice where dozens of people were killed when a lorry ploughed into a crowd celebrating Bastille Day.