Bomb squad is responding to an alert at the Menlo Park campus.

At least building at Facebook's headquarters was evacuated Tuesday night after a bomb threat was received.

The San Mateo bomb unit is responding to the alert at the company's campus in Menlo Park, California, the Menlo Park Police Department said in a statement.

A Facebook representative confirmed that a few buildings on the campus had been evacuated and that all employees were safe.

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