Amateur video filmed on Wednesday shows two gunmen shooting a wounded Paris policeman in the head.
It's believed the gunmen are two of three who stormed the Paris offices of the weekly satirical magazine Charlie Hebdo, renowned for lampooning radical Islam, killing at least 12 people, including two police officers in the worst militant attack on French soil in recent decades.
The video which is shot from a balcony above, shows the gunmen, both dressed in black, walking forward from their vehicle down a Paris street while firing rounds, before the camera is turned to show a police officer lying on the footpath.
The gunmen then run towards the police officer who raises his hands, before one of the gunmen shoots him in the head.
The men then continue running down the road a short distance before turning and running back towards a black vehicle where they get inside and carefully drive off.