Facebook site evacuated after mail tests positive for sarin

A Facebook mail processing warehouse near company headquarters was evacuated Monday as officials work to determine what caused mail to test positive for the nerve agent sarin.

Menlo Park Fire Marshal Jon Johnston said Monday that incoming mail undergoing routine processing by machine tested positive for sarin, but that there are no reports of injuries at the Silicon Valley site.

"Right now we don't have anybody that has any symptoms," he said.

"We're just doing verification."