At least ten people have now been arrested or taken into custody after the murder in the Paris suburb of Conflans-Sainte-Honorine.
The French history teacher who was murdered in a Paris suburb by an 18-year-old had been subjected to threats and a dissatisfaction campaign on social media.
He was accused of using caricatures of the Prophet Muhammad in his teaching.
The teacher was attacked with a long knife.
The suspect in the act is an 18-year-old man who was shot to death by police.
According to the news agency AP, the clip above shows the course of events.
According to an anonymous witness and the news agency AP, one of the police officers was heard saying "put down your weapon", several times.