Several buildings on Facebook's main campus in California were temporarily evacuated yesterday because of a bomb threat, reports CNN. Police later reopened the area after determining it safe.

The San Mateo bomb unit arrived at Facebook's Menlo Park campus, said the Menlo Park Police Department. They found no suspicious packages or devices.

A Facebook spokesman said police evacuated a few buildings on the campus. "We take the safety and security of our people at Facebook extremely seriously and are glad that everyone is safe," the spokeman said in a statement. "We are working closely with local authorities to investigate this threat and further monitor the situation."