Hopefully turns out to be a hoax. However, with hope not being a strategy, the last few hours in Charleston have been a bit tense. The USCG and FBI have been working on a reported threat of a dirty bomb aboard the Maersk Memphis. This is a 300 meter long container ship currently docked in Charleston. A one nautical mile safety zone has been established around the ship (not sure how that works on land).
Lastest USGC statement:
http://bit.ly/2ryEWlX