A teacher has been attacked in a classroom in Aubervilliers, a suburb of the French capital, Paris, by a man citing the so-called Islamic State.
The attacker shouted: "It's Daesh [Islamic State]. It's a warning", stabbing the teacher with a box cutter or scissors before fleeing.
The life of the teacher, 45, who was alone in the room, is not in danger.
France remains on high alert after the terrorist attacks in Paris on 13 November that left 130 people dead.