The social networking giant is investigating the matter in co-ordination with local authorities.
After assessing all of the circumstances, the United States Postal Service and Federal Bureau of Investigations (FBI) were requested because the suspected package had been mailed via the US Postal System.
Sarin, which is colourless, odourless, and tasteless, was reportedly detected by mail scanning machines in the facility.
"Authorities have confirmed test results were negative for any potentially risky substance and the buildings have been cleared for repopulation. Our rigorous security and safety procedures worked as meant to limit exposure and keep our people safe".
The FBI says in a statement Tuesday the agency and its law enforcement partners "thoroughly tested the items in question and determined them to be non-hazardous".
According to SFGate, at least two people at the mailing facility might have been exposed to the substance.
Initial reports that two people were exposed and needed medical attention were false.
A false alarm at Facebook's offices prompted the evacuation of four buildings over the potential presence of deadly poison sarin.
With all that in mind, a hazmat team entered the building around 6 p.m and tested the package.
For the time being, the specialists are still testing the package but the alleged attack has increased the concerns of tech companies over security. A year ago three people were shot after a deranged vegan bodybuilder tried to take revenge for being deplatformed but, to date, no-one has tried a chemical attack. In that case, the shooter appeared to have been angry at how YouTube had handled her channels and videos. The package set off sarin alarms in equipment created to screen all incoming deliveries for toxins.
Fire officials in Menlo Park, California, which is part of Silicon Valley, said the staff was evacuated and the bag was quarantined.
But as someone who's always interested in whatever Luhrmann's up to, I'm intrigued by the notion of him taking on The King. Baz Luhrmann's upcoming Elvis Presley biopic is now testing some big name actors to play the singer in the movie.
Police announced that they will address the media with more information about the counter-terror operation later on Tuesday. The man has been under surveillance for the past 12 months since returning to Australia from Lebanon previous year .
The FDA said another puzzling aspect of the recent spike in DCM cases is that they have occurred just in the last few years. The mean weight of the dogs in the reported cases was 67.8 lbs and the mean age was 6.6 years old.
It sees the entire city as its capital while the Palestinians see the eastern sector as the capital of their future state. Palestinians accuse Israel and the foundation of seeking to push them out of Jerusalem.
The council has warned it would hold the protest movement "entirely responsible if any soul is lost" in Sunday's protests. The Transitional Military Council should respect these rights, permit peaceful protests , and avoid any use of violence.
Mais Alex Morgan a redonné l'avantage aux Américaines, à nouveau de la tête (31e), son sixième but dans le tournoi. Les Américaines ont décroché mardi leur billet pour la finale de la Coupe du monde de soccer féminin.
Early into the game, Christen Press - who started instead of Megan Rapinoe - scored the usa team's first goal. Bird won three WNBA titles (2004, 2010, 2018) and four Olympic gold medals (2004, 2008, 2012, 2016).
Most cases were reported in the months of July and August, and 2016 was a peak year for outbreaks with more than 80. A small but mighty percentage of cases were also linked to drinking raw (unpasteurized) milk or apple cider.
Quant au poste de Haut représentant pour les Affaires étrangères, il sera confié au ministre socialiste espagnol Josep Borrell. C'est le président du Conseil, Donald Tusk, qui a annoncé ces noms, sur Twitter, à l'issue des négociations.
Nigel Farage tweeted an image of his party's protest, saying: "The Brexit Party has already made its presence felt". Barry Andrews and Deirdre Clune will only take their seats if and when the United Kingdom leaves the EU.
Nike pulls July 4 shoe after Colin Kaepernick objects
Kaepernick past year became the face of Nike's advertisement marking the 30th anniversary of the company's "Just Do It " slogan. Fox News host Laura Ingraham also criticized the decision, writing on Twitter , "No more @ nike sneakers for our family".
14 sailors killed in Russian submersible fire
In 2011, one of Russia's biggest nuclear submarines caught fire while undergoing repairs in dock in the northern Murmansk region. The submarine was operating in Russian waters and is now heading to the Severomorsk naval base, Russian media reports.
Federer reaches Wimbledon second round
However, the 37-year-old professed herself to be content with her performance as she has been struggling with a knee injury. The 30-year-old has not played a match on the main tour all year and needed to qualify to make the main draw at Wimbledon .
Naeher stops late penalty; USWNT advances to World Cup Final
Spectators in France and around the world may have had their doubts when they saw US head coach Jill Ellis's starting lineup. Press delivered first, scoring on a header off a long cross from Kelley O'Hara that sailed over Telford's outstretched arm.