KNBC-TV 1:24 p.m. PDT June 1, 2007 ARCADIA, Calif. - An hour-long lockdown was ordered at Arcadia High School after a caller dialed 911 and stated "a student was on campus with a gun." Live Video Police searched the campus, but the lockdown was called off at about 1:15 p.m. A view from Chopper 4 showed students walking from a building. KNBC reported that police transferred students from one building to another. Nearby streets remained open. KNBC's Justin Jaeger said police blocked entrances and exits around the campus. Jaeger said it remained unclear whether a person with a gun was actually on campus.