Someone called Bowditch Middle School at about 1:20 p.m. saying he was going to blow up the campus, said Foster City police.
School administrators evacuated the campus, keeping students and staff outside while a team of explosives experts and bomb sniffing dogs searched the campus, police said.
No bomb was found.
The search for the bomb lasted longer than the school's dismissal time so students were sent home, police said. Classes will resume as usual Monday.
An investigation into the threat is ongoing.
Bowditch Middle School is located at 1450 Tarpon St.
