A youth in possession of several weapons opened fire at a high school in the southern French town of Grasse, police said.
Several people were injured in the shooting and the school headmaster was hospitalised.a
The shocking incident took place at the Alexis de Tocqueville school.
According to police sources, one suspect has been arrested while another is on run.
Following the shooting, France issued a terror attack warning on Thursday and all schools in the town have been locked down.
Grasse town hall, meanwhile, said that the shooting was following a quarrel between two students and it was not terror related.
Christian Estrosi, president of the Provence-Alpes-Côte d’Azur region around Grasse, told France Info radio that the injuries of headmaster are not serious.
French newspaper Le Monde reported that the arrested in connection to the incident is a 17-year-old student of the high school and it is still unclear whether weapons in his possession were operational.
Residents of the area have been advised to not move out of their residents. French government has also launched its mobile telephone application warning of a terror attack.
The interior ministry made it clear that the probe is going on and live updates will be given through social media.