HALF MOON BAY -- The Half Moon Bay High School campus was evacuated Tuesday morning after a bomb threat was called in, according to authorities.

The San Mateo County Sheriff's Office confirmed to KPIX that there were rumors of a potential bomb threat at the school over the past few days. 

While a school resource officer was working with Half Moon Bay High officials to investigate and found the rumor was not credible, at 9:30 a.m. the school received a bomb threat over the phone, the sheriff's office said. 

Out of an abundance of caution, Half Moon Bay High students and staff are being safely evacuated so authorities can conduct a bomb sweep. Parents and guardians are being asked not to come to the school unless notified.