Oceanside High School was put on lockdown after a bomb threat was phoned in to the school Wednesday afternoon.
Oceanside Police said the voice on the phone seemed to be automated and computer generated and said a truck loaded with explosives was going to drive into their building, though the caller did not mention the school of anyone by name.
Police said the school had let out at 12:30 p.m. Wednesday for a scheduled staff meeting and few students were on campus at the time the threat came in.
The lockdown was lifted shortly before 3:30 p.m.
Two other schools received threats Wednesday that prompted official action.
A lockdown at Otay Elementary School was lifted after several people reported seeing an armed man near campus, police said.
One suspect was detained that may have been related to the incident, Chula Vista police said. Students are being dismissed through the west side of the campus.
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Police said several people reported seeing a man with a gun near Otay Elementary School shortly after 12:30 p.m. Wednesday which in turn prompted a temporary lockdown, police said.
Students at San Ysidro High School were also evacuated to the football field after the school received a bomb threat Wednesday morning.
A secretary received the call at 10:12 a.m. It was a recorded message that stated a bomb could go off in a few minutes, according to the San Diego Police Department.
Officials placed the school on lockdown and sent students to the football field, according to the Sweetwater Union High School District.
In 2013, an elementary school was placed on lockdown after receiving a report of a threat.
This is a developing story. Check back for updates.
