A French preschool teacher, who alleged he was stabbed by Islamic State supporter on Monday, has admitted to making the story up.

According to BBC News, the teacher initially claimed he was alone in a classroom in Aubervilliers, a Paris suburb, when a man entered and stabbed him while shouting support for the ISIS terror group.

"This is for Daesh [Islamic State]. It's a warning," said the man, according to the 45-year-old unnamed teacher.

Prosecutors now report the man said he wounded himself with a box cutter. Investigators are currently trying to determine his motive for lying.

The teacher had stab wounds to his neck and side. He was later treated at the hospital for the injuries.

France has been in a state-of-emergency, following the Nov. 13 Paris attacks in which 130 people were killed by Islamic State militants.

The teacher's tale sparked a manhunt throughout the suburb, north of the French capital. The Paris anti-terrorism branch also started an investigation into the incident.

On Monday, Education Minister Najat Vallaud-Belkacem dropped by the scene, promising to increase security at French schools.

Classes were postponed at Jean-Perrin preschool where the fake incident allegedly occurred.

According to Aubervilliers Mayor Pascal Beaudet, the teacher had 20 years experience at the preschool and was well regarded by parents in the community.

Last month, ISIS called for French sympathizers to target teachers, in the terror organization's French-language publication "Dar-al-Islam". The group deemed educators to be "enemies of Allah" for teaching secularism.

Many teachers, such as Rachel Schneider of the French primary school teachers' union SNUipp, were shaken by the threat.

"We have received many calls from colleagues, who are very worried," Schneider said to the BBC. "They don't necessarily think there will be an organized attack, but they fear this message of murderous madness will inspire unstable people to action."