A North Korean coal trans-shipper returned to South Korea’s shores in early July, its second visit to the South in two months, the NK Pro ship tracker shows.

The Liberia-flagged Great Roc moved North Korean coal several times in 2017, according to a report from the UN Panel of Experts (PoE) published the following year.

The Great Roc — formerly called Great Spring — left South Korea’s Pohang port on Tuesday, after calling in at a berth that appeared to handle bulk commodities like coal.

According to the PoE, the vessel was involved in