French police hunted Tuesday for a group of gunmen who killed two prison officers in an attack on a highway toll booth that freed a convict linked to gangland drug murders.

President Emmanuel Macron vowed that everything would be done to find those behind the attack, with the inmate also still at large, as well as those who helped him escape.

Two prison guards were killed in the attack and three others were wounded. Another was fighting for his life in hospital and two others were in critical condition.

The inmate was being transported back to his prison in the town of Evreux after being questioned by a judge in the regional center of Rouen in Normandy. The prosecutor said the prison van was rammed headon by a stolen Peugeot as it passed through the toll booth. But the prison van was also followed by an Audi, from which gunmen emerged and fired at both vehicles in the prison convoy.

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