Northwood High School in Irvine was placed on lockdown Thursday afternoon due to an anonymous phoned threat that appears to have been a hoax, police said.
Posts on social media in the 2 p.m. hour indicated the school — at 4515 Portola Parkway — was locked down and armed officers were responding. An Irvine Unified School District official confirmed the lockdownt to KTLA, saying an anonymous threat prompted the decision.
A male caller phoned the Irvine Police Department's business line shortly after 1:40 p.m. and said he was a student locked in a bathroom on campus with guns and explosives, police said on Facebook. Officers arrived on campus, put the school on lockdown and searched the grounds.
Classrooms were evacuated one at a time beginning about 2:40 p.m., Irvine Unified School District said on its website.
"After an extensive search no suspicious subjects or activity were noted by officers on scene," the Police Department stated.
No one was hurt and there's no indication that there's a threat to the community, police said.
"The investigation into the origin of the call will continue," the Police Department said. "Preliminarily, it appears the call was a hoax."
Lt. Lane Lagaret with the Orange County Sheriff’s Department said a helicopter and bomb squad were sent to the school to assist police.