Four held amid probe into deadly French police station attack

Police officer blocks the access next to the Police station in Rambouillet (AP)

French authorities have detained a fourth person as anti-terrorism investigators question three others after a police official was fatally stabbed at a police station outside Paris.

French police killed the Tunisian suspect on Friday after the killing of an unarmed administrative employee at the entrance of her police station in the town of Rambouillet.