Four of the social media company’s buildings were evacuated on Monday and two people were checked for possible exposure to the compound that attacks the nervous system and can be fatal.
But exhaustive testing by fire and hazardous material teams found no toxic material, said Jon Johnston, fire marshal for the city of Menlo Park in California where Facebook is based.
“There is no sarin,” he told Reuters, referring to the package that had erroneously tested positive on Monday morning.
Facebook routinely checks all packages and had initiated a standard safety protocol, Johnston added, saying teams worked into the early hours of 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 the all-clear on Tuesday.
With 2.3 billion monthly active users and more than $55 billion in revenue in 2018, Facebook is massively popular around the world but also faces criticism for its control of personal information and has been subject to cyber attacks.
Based on Reuters