Facebook headquarters cleared after false threat

March 12, 2014
This May 11, 2012 file photo shows the Facebook campus in Menlo Park, Calif. Police flooded Facebook's headquarters Tuesday March 11, 2014 in Northern California to investigate a threat they later found wasn't credible. (AP Photo/Jeff Chiu, file)

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 along a report of a threat shortly after 7 p.m.

Bertini says the was found to be unsubstantiated and not credible. He would not give further details.

The area was declared safe, and employees were allowed to leave at about 8:30 p.m.

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.

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