One student is dead and at least three people seriously hurt in a Thursday French school stabbing. The 15-year-old attacker was arrested at Notre-Dame-de-Toutes-Aides school in Nantes.

The motive was unclear for the attack, which occurred at a time of heightened concern in France about knife attacks in schools.

One student has been killed and at least three people were injured in stabbing at a private school in western France, French media say. The attack took place at Notre-Dame-de-Toutes-Aides school in Nantes on Thursday afternoon, according to reports. The attacker is said to have been arrested at the scene after being restrained by a teacher.