CONCORD, Calif. (KRON) — Mt. Diablo High School was placed on lockdown on Monday morning so police could investigate a staff concern.
The Concord Police Department said the lockdown was a precautionary measure as of 10:30 a.m. The lockdown was lifted by 10:51 a.m.
“There has not been a shooting at the school and no one was seen with a gun,” police tweeted.
According to the Concord Police Department, a magazine of ammunition was found. No gun was located.
The school was put on lockdown as a precaution, officials said.