(KTXL) — Colfax High School was under lockdown for for two hours on Tuesday after an unknown person was spotted on the campus, according to the Placer Union High School District.

The district shared about the lockdown at 10:56 a.m., saying that “law enforcement has secured the campus and is working.”

At 1:40 p.m., the lockdown was lifted by the Placer County Sheriff’s Office and parents were allowed to pick up their student from campus.

The Placer County Sheriff’s Office said they checked the main campus and the wooded area surrounding the campus.

“In response to a report that there may be an individual on campus who is not a student, law enforcement has placed the school on a precautionary lockdown and is walking the campus, Colfax High School Chastity Raybuck-Bonilla shared in a message to the Colfax Community. “At this time our students and staff members are safe and our campus is secure.”

All sports and games were canceled for the day at the school as the sheriff’s office does not believe they will complete their search before the final school bell, according to Raybuck-Bonilla.

Students remained on campus until the sheriff’s office’s investigation is completed and parents can go to the Sierra Vista Community Center where the sheriff’s office will be answering questions.