In this clip, a man is held on the ground by police officers in the Paris suburb of Ivry-sur-Seine.
According to the filmer, the video was shot after the man attacked a police agent with a knife.
The officer is seen bleeding from his hand and then laying on the ground in pain.
The alleged attacker is then filmed being carried away by a police car.
Details of the incident are still unclear.
The clip was filmed today (July 31) at 11.30 am (CEST), in front of the Centre Commercial of Ivry mall, on Boulevard Paul Vaillant Couturier.