A manhunt is underway for a prisoner who escaped from a prison van during an ambush by armed men who killed two prison officers and wounded others.

The prisoner on the run, Mohamed Amra, is said to have ties to a gang in the southern city of Marseille, which has been plagued by drug-related gang violence.

Known as "The Fly", Amra was being taken from court to a prison in the city of Rouen near Paris on Tuesday when a car rammed the prison van at a toll booth and armed men opened fire.

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