At least 84 people have been killed after a lorry ploughed into a crowd attending Bastille Day celebrations in the French city of Nice on Thursday night, in what is being investigated as a terror attack.
The driver ploughed on for 2km on the Promenade des Anglais after fireworks, before being shot dead by police.
President Francois Hollande said the attack was of “an undeniable terrorist nature”.
A state of emergency, in place since November’s Paris attacks, has been extended by three months.
“France is badly hit,” Mr Hollande said, adding that “we need to do everything we can to fight against” such attacks.
“All of France is under the threat of Islamic terrorism,” he said, adding that several children were among the dead.
The president added that “operational reserves” would be deployed to support the army and security forces across the country, with particular focus on the borders.