Two 13-year-old girls were seriously injured and a 16-year-old suspect was arrested after an incident at a school in Upper Bavaria, Germany.

Police said a large operation was underway in the area of ​​the Welfen-Gymnasium high school in the small town of Schongau.

The suspect was carrying a knife and a firearm, police said, and they believe he acted alone.

None of the girls is in mortal danger, but the number of other people involved and the severity of their injuries are currently being clarified, police added.

A police spokeswoman had previously told the AFP news agency that it was unclear what weapon had been used in the attack and declined to confirm reports of a knife attack.

The identity of the suspect is unknown and it is unclear if he had ties to the school.

The police spokeswoman added that the forces believe it is a “disturbance.”

A contact point for family members and parents of students has been created at a fire station in the city.

According to its website, the school was founded in 1887 and was initially almost exclusively a girls’ school. It has been mixed gender for the last 40 years.