A major incident has occurred in Facebook’s Headquarters in California.
It’s understood that two Facebook workers have possibly been exposed to sarin gas at a mail room at the social media company’s headquarters.
The mail processing centre was evacuated as officials worked to determine what caused mail to test positive for the nerve agent.
“We have two possible exposures but right now they are not exhibiting any signs or symptoms,” Menlo Park Fire Marshal Jon Johnston said.
Facebook officials say that a number of people have been rushed to medical facilties with some workers allowed back into the building.
This story is developing.