A teacher has been beheaded in a north-western suburb of Paris, with the attacker shot dead by police.
The victim is said to have shown controversial cartoons of the Prophet Muhammad to his students.
The attack occurred at about 17:00 local time (15:00 GMT) near a school. Anti-terror prosecutors are investigating.
French President Emmanuel Macron visited the scene, calling the killing an “Islamist terrorist attack”.
Mr Macron said he was murdered because he “taught freedom of expression”. The victim has not been named.
The knife-wielding attacker was shot as officers tried to arrest him in the aftermath of the attack. Police have not released any personal details about him.
A trial is currently under way in Paris over a 2015 Islamist assault on the French satirical magazine Charlie Hebdo, which was targeted for publishing the cartoons.
Three weeks ago, a man attacked and wounded two people outside the magazine’s former offices.