(Menlo Park, CA) -- Fire officials now say no one was exposed to a chemical warfare agent at a Facebook mailing facility in Northern California on Monday.
The fire department in Menlo Park, located just south of San Francisco, say an alarm notified the workers a package may contain the nerve agent sarin.
Initially it was feared two workers were exposed.
A hazmat crew tended to the scene scene and to test the package from where the agent may have come.
The building was evacuated.
This is a developing story. Check back for updates.