SAN FRANCISCO (Reuters) – Facebook's ( FB.O ) The Silicon Valley campus received Tuesday's clear thought for fear that a parcel at the post office contained the nerve agent sarin.
Four of the social media company buildings were evacuated Monday and two people were checked for possible exposure to the compound that attacks the nervous system and may be fatal.
But exhaustive testing of fire and hazardous material teams found no toxic material, said Jon Johnston, fire-fighting city of the city of Menlo Park in California, where Facebook is based.
"There is no sarin," he told Reuters, referring to the package, which was mistakenly tested on Monday morning.
Facebook routinely checks all packages and had launched a standard security protocol, added Johnston and said that teams were working into the early hours on Tuesday to clear the scene.
Federal Bureau of Investigation (FBI) agents also went to the scene, Facebook said. No company representative was immediately available to confirm clear Tuesday.
With 2.3 billion monthly active users and more than $ 55 billion in revenue in 201
In December, it had a bombing threat on the main campus in Menlo Park, which forced the evacuation of several buildings.
No bomb was found.
Sarin was used in a 1995 attack by a Japanese cult on the Tokyo subway, killing 13 people and injuring thousands.
Recently, the Syrian government has been accused of using sarin against rebels during their civil war. It denies it.
Reporting by Katie Paul in San Franciso; Andrew Hay in New Mexico, Dan Whitcomb in Los Angeles and Rich McKay in Atlanta; Editing by Richard Chang, Lisa Shumaker and Andrew Cawthorne