[Updated] Dirty Bomb Threat in Port of Charleston

Authorities have now determined that there is no existing threat to the Port of Charleston in the U.S. after earlier fears that a container on the Maersk Memphis may have contained a dirty bomb.

A unified command was established which identified four containers believed to have posed a threat. However, the containers have now been scanned and cleared.

The person believed to have reported the threat has been detained by authorities for questioning.

The incident started at approximately 8 p.m. local time on Wednesday when authorities were made aware of the potential threat.

The, Maersk Memphis, currently moored at Charleston's Wando terminal was evacuated while law enforcement units from federal, state and local law enforcement agencies investigated. Additionally, the Coast Guard established a one nautical mile safety zone around the vessel.

There appears to be a link between the threat and a YouTube video titled Maersk Memphis Update: US Coast Guard / DHS Sweep for Radioactive Material: