The man was decapitated in the Val d’Oise.
A police source said French officers shot dead a man who attacked another with a knife and beheaded the victim.
The suspect had fled following the attack.
He had been chased by police, and managed to reach the town of Eragny-sur-Oise , in the Val-d’Oise
France’s anti-terror prosecutor is investigating the attack, which took place in Conflans Sainte-Honorine, a suburb north-west of Paris.
A second police source said witnesses heard the attacker shout Allah Akbar, or God is Great.
This is a breaking story. More to follow…