Police knew suspect in Grenoble attack pic.twitter.com/qNz9PhzNE8
Two men drove into the main gate of the factory soon after 10am, before driving around in circles throwing gas cylinders around the main yard, according to reports.
One of the men then jumped out of the car, according to local prosecuting sources, and then 'decapitated a man'.
An Islamic flag – possibly that of Islamic State – was seen next to the dead body. The man’s head was found some 30ft from the corpse.