Here's what we know:

- Someone in the clerk’s office received a letter with a substance inside.

- A note said the substance was Anthrax.

- @MarkWinneWSB has learned that three employees have been quarantined and are being checked out.

LIVE updates right now on Channel 2. pic.twitter.com/BuiEQiuShu

— WSB-TV (@wsbtv) June 25, 2019