CONCORD, Calif. (KCBS) -- Mt. Diablo High School in Concord is on lockdown this evening after students reported spotting a man with a gun. Police have set up a perimeter around the campus as a precaution, with students remaining inside.
Hundreds of students remained locked down on campus for several hours after reports of a man with a gun on campus.
Police were unable to find any such person and made no arrests.
This is the second time the campus has been locked down in just over a month. It was temporarily closed on October 14 after a verbal altercation led to rumors about a possible gun on campus.
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