Five separate bomb threats forced the Fullerton Police Department to lock down four schools and evacuate a hospital on Thursday.

The series of bomb threats began at about 1:25 p.m. when a caller claimed they planted explosives at Troy High School. As officers responded to the campus, the Fullerton Union High School received a similar threat about 24 minutes later.

Four minutes later, at 1:53 p.m., Sunny Hills High School received a bomb threat. As officers surveyed the situation at the three schools, Fern Drive Elementary School received another bomb threat at 2:20 p.m.

Fullerton PD, with help from other agencies, responded to each campus with explosives-detecting canines.

They did not find any explosive devices at the four schools. Roughly three hours after the bomb threat at Fern Dri

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