PARIS — A student at a French high school stabbed four other students at his school Thursday, killing at least one and injuring three others before being arrested, police said. The circumstances of the attack were not immediately clear. A national police official said the attack occurred at the private Notre-Dame-de-Toutes-Aides High School in Doulon, near Nantes on France’s Atlantic coast. The student stabbed four people before teachers subdued him, and he was later taken in by police, the official said. The official was not authorized to be publicly named according to national police policy. Images from the scene showed police surrounding the school as the investigation got under way. Fatal attacks are relatively rare in French schools. The Associated Press