A primary school teacher in the southern French town of Albi has been stabbed to death in front of her class by a pupil's mother, police say.
Fabienne Terral-Calmes, 34, was attacked at the Edouard Herriot school on Friday morning.
The suspect, 47, was arrested at home shortly afterwards, prosecutors say.
Education Minister Benoit Hamon said she appeared to have a "serious psychiatric disorder", according to initial investigations.