Three prison officers shot dead as gunmen attack jail van & free inmate as vehicle stopped at tollbooth in France

THREE prison officers were shot dead when they were ambushed while transporting an inmate today.

Four armed men pounced on the convoy at a tollbooth in northern France and helped the prisoner to escape.

GettyThe police convoy was attacked in northern France as cops moved an inmate[/caption] Video online appears to show emergency services gathered at the tollbooth today A fire engine also appeared at the scene

The prisoner and attackers are now on the run with two vehicles...