Three people were killed and several others injured in what French President Emmanuel Macron said was an "Islamist terrorist attack".
A man armed with a knife attacked church-goers in the French city of Nice.
Authorities said the attack took place inside Notre-Dame basilica in the heart of Nice's old city and that the attacker was shot and wounded. He was taken to hospital.
France’s anti-terrorism prosecutor, Jean-Francois Ricard, said a man and woman were killed inside the church. The third victim, a 44-year-old woman who managed to flee, died at a nearby restaurant.
A 60-year-old woman whose body was found at the entry of the church, suffered “a very deep throat-slitting, like a decapitation,” Ricard added. The 55-year-old man also died after deep cuts to his throat.
The attacker is believed to have shouted "Allah Akbar" as he carried out the assault, according to an unconfirmed claim from a police source.
Nice's mayor has said the man continued to shout the words as he was tackled by police.
An investigation has been opened for murder and attempted murder in connection with a terrorist enterprise - a common term for such crimes.