Updated at 11:15 a.m. April 13, 2016

A bogus bomb threat prompted a several-hour lockdown and a multi-agency search at Point Loma High School Wednesday.

A counselor at the Chatsworth Boulevard campus received the menacing massage via email about 8:15 a.m., according to San Diego Unified School District officials.

Teachers kept all students secured in their classrooms while school police conducted a sweep of the grounds and building, aided by San Diego city and harbor police and personnel with the federal Bureau of Alcohol, Tobacco, Firearms and Explosives.

Nothing hazardous was found, and the lockdown was lifted just before 10:30 a.m., SDUSD communications director Linda Zintz said.

No suspects in the crime had been identified or arrested as of late morning.

—City News Service