Police evacuated students at Los Angeles Valley College on Wednesday night as authorities investigated unconfirmed reports of shots fired on the campus.
The Los Angeles County Sheriff's Department said on Twitter that officers were on scene and had so far found no evidence of a shooting or any victims.
The evacuations were occurring as a precaution as police spread through the campus on Fulton Avenue.
A Los Angeles police spokesman told City News Service that the department received reports from people who said they heard what sounded like gunshots on the campus.
A Sheriff's Department official later said on Twitter that the noise might have actually been a car backfiring but that the search was continuing.
Valley College put out an alert stating: "LAVC is currently on lockdown due to an unspecified threat. If on campus, lock doors and shelter in place until further notice."