Bomb threat in one of the buildings on Facebook campus in Menlo Park, California, has not been confirmed, Menlo Park Police Department said in a statement.
"The San Mateo County bomb unit was dispatched with explosive detection dogs that conducted a sweep of the building and found no suspicious packages or devices," the police said.
The building is clear and secure, it added.
Earlier, the police responded to a bomb threat that forced an evacuation of at least one building on the Facebook campus. The police reportedly received an anonymous phone call on the bomb threat.
READ MORE: Three Dead, Many Injured After Shooting at Christmas Market in France — Police
A company spokesman later said that Facebook was looking into a bomb threat at its headquarters campus in Menlo Park, Reuters reported.
The spokesman also said that several buildings were evacuated.