An unidentified man stabbed a40-year-old elementary school teacher in the side and the throat with a box cutter, on Monday, the Le Parisien newspaper reported, at the Jean Perrin d'Aubervilliers school in the northern suburb of the French capital.
According to reports, the attacker was dressed in painter's overalls and a balaclava and said "That's for Daesh (ISIS), this is a warning."
The teacher's life is not in danger and is being treated in hospital for multiple stab wounds.
Local police said the man fled the scene and is still at large.