A false alarm at Lodi High School prompted a massive police response Wednesday morning.LiveCopter 3 saw dozens of patrol vehicles and several parents on campus.Sign up for our NewslettersA community alert from the school initially said school staff were trying to determine where the alarm came from but that there were "no reported incidents.

Lodi High School was briefly locked down after a substitute secretary accidentally pressed an alarm, but the district confirmed that no one was in danger and all school activities resumed after police found no threat or significant incident.

A teenager is in police custody after he directed threats of violence toward a Lodi school, the police department said on Monday.