The deadly poison sarin has been detected at a mail facility for Facebook in Menlo Park, California, prompting building evacuations and FBI involvement.

On Monday, routine tests for sarin detected the presence of the substance in a mailbag at the social-media tech firm’s offices, a Menlo Park Fire Department (MPFD) official told Business Insider. The mailbag is now under quarantine.

A number of people who work at the facility are now being monitored, but no one is showing any symptoms of exposure

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