Published: Aug 16, 2011 8:10 PM EDT
Updated: Aug 16, 2011 8:49 PM EDT

SANTA MONICA, Calif. (AP) - UPDATE: Police have lifted a lockdown at Santa Monica College that began with a telephone report of an armed man on the Southern California campus.
    
Santa Monica police Lt. Kathy Keane said Tuesday that someone had called police after hearing what sounded like a gunshot. After an extensive search of the school, officers found no evidence of a gunman or any gunshot.Santa Monica College is on lockdown after three people reported seeing a gunman on the Southern California campus.
    
College spokesman Bruce Smith said calls came in around 11 a.m. Tuesday saying there was an armed person on campus.
    
School is not in session but teachers and some incoming freshmen are on the college grounds.
    
Police have not verified the calls or determined if any shots have been fired.

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