Update: Grasse Town Hall says the shooting incident is not terrorist related, according to Sky News.
A school shooting in the the southern town of Grasse has left at least two people injured, according to police sources (via BBC News).
The country has issued a terror attack warning following claims a man in possession of several weapons opened fire on the headmaster of Tocqueville school.
One man has been arrested, but another suspect is on the run, police said. Residents are advised to stay inside.
Anti-terrorist commandos are currently on the scene, and the government has sent out a warning of a terrorist attack via its mobile app.
Grasse is known as France's perfume capital.
More to follow...
Meanwhile, a letter bomb has exploded at the International Monetary Fund office in Paris, injuring the employee who opened, police have said.
Staff have been evacuated, and IMF director Christine Lagarde has condemned the "cowardly act of violence" .