SAINT-ETIENNE-DU-ROUVRAY (FRANCE), July 27, 2016 (Xinhua) -- French police stand guard near the church which was attacked in Saint-Etienne-du-Rouvray, Seine-Maritime department, France, July 26, 2016. Paris Prosecutor Francois Molins on Tuesday said one of the knifemen who slaughtered a priest in a church in northern France was "categorically identified" as Adel kermiche, 19. He was known to intelligence services and tried to join radical insurgents in Syria twice in 2015. (Xinhua/Zhang Xuefei)