Video has emerged showing a brief gun battle in Paris before a gunman approaches and appears to kill an injured police officer.
The video, circulated on Facebook, shows two gunmen stood next to a Black Citroen car firing at a police officer stood on the pavement on a tree-lined boulevard.
The two men then approach the officer, who can be seen lying on the ground and holding out his hand, before one them shoots him in the head.
The two gunmen then run back to the car and drive away.
It is believed they were fleeing the scene of the Charlie Hebdo offices which left 12 people, including two police officers dead and seven other injured, some seriously.