[Updated at 7:27 p.m. ET] A lockdown imposed Tuesday on the campus of California's Santa Monica College after it received an unconfirmed report of a gunman on campus was lifted an hour later, a school spokesman said.
Santa Monica police said the college received a call late Tuesday morning that someone may have fired a gun on campus, and the school was locked down.
College spokesman Bruce Smith said the lockdown was lifted an hour later, at about 12:15 p.m. PT, after police did a "complete sweep of campus" and found nothing to verify the report.
Santa Monica Police Sgt. Richard Lewis said it was believed a student on the phone with her mother heard loud construction sounds and mistook them for gunshots.