(KRON) — There was a stabbing at Northgate High School in Walnut Creek and one student is in custody, the Mt. Diablo Unified School District confirmed to KRON4. The victim of the stabbing has been taken to a local hospital and is in stable condition, according to the Walnut Creek Police Department.

Both of the students involved were in the 9th grade and were acquaintances. The suspect is a male and the victim is a female. No other students were involved. The victim and her attacker are allegedly classmates, but so far, we don’t have a motive for the attack.

The Walnut Creek Police Department told KRON4 it received a call around 1 p.m. on a report that a student had assaulted another student and that medical attention was required.

There are counselors on-site who will remain on-site on Wednesday. Students have returned to class.

Police are calling the event an isolated incident and say there is no further threat to students or staff.

The suspect was taken to the Contra Costa Juvenile Hall and is being held without bail. He is facing charges of attempted murder and mayhem.