(CBS/AP) -- A gunman opened fire at a high school in southern France on Thursday, reportedly wounding a staff member and two others before being taken into custody.

Police did not immediately confirm casualties or any other details of the incident.

French television reports said one man -- a student at the school -- was taken into custody after three people, including the school’s head teacher, or principal, were fired on.

Interior Ministry spokesman Pierre-Henry Brandet said a 17-year-old student from the school was arrested after Thursday’s shooting.

“We are still in the phase of rescue, of searching for a possible second perpetrator,” Brandet said on BFM television. He said it is too early to know the motives for the attack.

Christian Estrosi, a senior regional government official, told the French news agency AFP the shooting was not being investigated as a terror attack. He said the principal and two pupils were lightly injured.

The incident comes as France remains in a state of emergency following deadly attacks in Paris in 2015 and an attack last year in the city of Nice, which is 25 miles away from Grasse.

Police from Nice helped respond to the incident in Grasse.

An employee of a nearby electronics store said police had asked residents to stay indoors. An employee of sports chain Decathlon, which has a branch less than 500 meters from the high school, said he’d seen about 40 high school students leaving from the area and gathering in a nearby parking lot.

The French national government sent out a regional alert warning of the attack at the high school after local police reported shots had been fired. The alert came in a system implemented by the government after the deadly November 2015 attacks in Paris.