Facebook Inc evacuated four buildings and two people were being evaluated for possible exposure to the nerve agent sarin on Monday after a package at the social media company's Silicon Valley mail facility tested positive for the toxic compound.

The people who came in contact with the suspicious package at about 11 am PT (1800 GMT) did not show any symptoms of exposure to sarin, said Jon Johnston, fire marshal for the city of Menlo Park, California, where <a href="https://www.wionews.com/world/facebook-inc-chief-executive-mark-zuckerberg-says-delay-in-flagging-fake-pelosi-video-was-execution-mistake-230784">Facebook</a> is based.

"The (Facebook) facility tests all of the packages that come in and they had a positive test, so they just initiated their standard protocol. Now we're just waiting to verify whether that’s true or not," he said.

Fire personnel were preparing to enter the mail facility at around 6 pm to assess the packages, Johnston said.

Facebook spokesman Anthony Harrison said the company evacuated four buildings following the positive test and was cooperating with police in the investigation.

"Authorities have not yet identified the substance found. As of now, three of the evacuated buildings have been cleared for repopulation," Harrison said.

Agents from the San Francisco office of the Federal Bureau of Investigation were responding to the scene, a spokesman for the agency said.

Sarin, a potent toxic compound that disrupts the nervous system, has been used as a chemical weapon. Exposure can be fatal.

Facebook Inc evacuated four buildings and two people were being evaluated for possible exposure to the nerve agent sarin on Monday after a package at the social media company's Silicon Valley mail facility tested positive for the toxic compound.

Facebook Inc evacuated four buildings and two people were being evaluated for possible exposure to the nerve agent sarin on Monday after a package at the social media company's Silicon Valley mail facility tested positive for the toxic compound. The people who came in contact with the suspicious package at about 11 am PT (1800 GMT) did not show any symptoms of exposure to sarin, said Jon Johnston, fire marshal for the city of Menlo Park, California, where Facebook is based. "The (Facebook) facility tests all of the packages that come in and they had a positive test, so they just initiated their standard protocol. Now we're just waiting to verify whether that’s true or not," he said. Fire personnel were preparing to enter the mail facility at around 6 pm to assess the packages, Johnston said. Facebook spokesman Anthony Harrison said the company evacuated four buildings following the positive test and was cooperating with police in the investigation. "Authorities have not yet identified the substance found. As of now, three of the evacuated buildings have been cleared for repopulation," Harrison said. Agents from the San Francisco office of the Federal Bureau of Investigation were responding to the scene, a spokesman for the agency said. Sarin, a potent toxic compound that disrupts the nervous system, has been used as a chemical weapon. Exposure can be fatal.

Facebook evacuates four buildings after possible sarin exposure

A bomb threat prompted authorities on Tuesday to evacuate a building at the Silicon Valley headquarters of Facebook, police said, but gave the "all clear" after an hours-long search turned up no sign of a device.

"The San Mateo County bomb unit was dispatched with explosive detection dogs that conducted a sweep of the building and found no suspicious packages or devices," they said.

"The building is all clear and secure," the police added.

Everyone is safe and the company is looking into the incident, the spokesman said in an emailed statement to Reuters.

Menlo Park Police Department said a building at 200 Jefferson Drive has been evacuated and the bomb units are on the scene going through the building.

However, it did not specify which Facebook building in Menlo Park was evacuated.

YouTube was another Silicon Valley company that faced security threat in the recent past. In May, a woman opened fire at YouTube's headquarters in San Francisco, wounding three people before she shot herself dead.

A bomb threat prompted authorities on Tuesday to evacuate a building at the Silicon Valley headquarters of Facebook, police said, but gave the "all clear" after an hours-long search turned up no sign of a device.

A bomb threat prompted authorities on Tuesday to evacuate a building at the Silicon Valley headquarters of Facebook, police said, but gave the "all clear" after an hours-long search turned up no sign of a device. "The San Mateo County bomb unit was dispatched with explosive detection dogs that conducted a sweep of the building and found no suspicious packages or devices," they said. "The building is all clear and secure," the police added. Everyone is safe and the company is looking into the incident, the spokesman said in an emailed statement to Reuters. Menlo Park Police Department said a building at 200 Jefferson Drive has been evacuated and the bomb units are on the scene going through the building. However, it did not specify which Facebook building in Menlo Park was evacuated. YouTube was another Silicon Valley company that faced security threat in the recent past. In May, a woman opened fire at YouTube's headquarters in San Francisco, wounding three people before she shot herself dead.

No suspicious package found in Facebook HQ at Menlo Park: Police

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Facebook evacuates four buildings after possible sarin exposure

No suspicious package found in Facebook HQ at Menlo Park: Police