<p><br />Police flooded Facebook's headquarters in Northern California to investigate a threat they later found wasn't credible.<br /><br /></p>.<p>Menlo Park police Commander Dave Bertini says Facebook's campus was locked down last night after San Francisco police passed on a report of a threat shortly after 7 pm local time.<br /><br />Bertini says the threat was found to be unsubstantiated and not credible, and would not give further details. The area was declared safe, and employees were allowed to leave about 8:30 pm.<br /><br />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.</p>
<p><br />Police flooded Facebook's headquarters in Northern California to investigate a threat they later found wasn't credible.<br /><br /></p>.<p>Menlo Park police Commander Dave Bertini says Facebook's campus was locked down last night after San Francisco police passed on a report of a threat shortly after 7 pm local time.<br /><br />Bertini says the threat was found to be unsubstantiated and not credible, and would not give further details. The area was declared safe, and employees were allowed to leave about 8:30 pm.<br /><br />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.</p>