Police cordoned off Facebook with yellow tape while K-9 unit searched the parking lot at Menlo Park in Northern California on Tuesday. Photo taken from Twitter
Police flooded Facebook's headquarters in Northern California to investigate a threat they later found wasn't credible.
Menlo Park police Commander Dave Bertini says Facebook's campus was locked down Tuesday night after San Francisco police passed on a report of a threat shortly after 7:00pm.
Bertini says the threat was found to be unsubstantiated and not credible, and would not give further details.
Photo taken from Facebook Menlo Park organisation profile
The area was declared safe, and employees were allowed to leave about 8:30pm.
More than 6,000 people work for the social media giant, but it wasn't clear how many were at the headquarters at that hour.