A North Korean vessel returned to China on Wednesday, calling in at a port which almost certainly handles prohibited commodities like iron and coal, satellite imagery and ship location information from the NK Pro ship tracker show.

The visit is the second time the 6200-tonne North Korean-flagged Jing Hung 8 has visited ports in China’s northeast within the space of a week, this time calling it at a large bulk handling pier in Longkou.

The ship most likely headed to North Korea’s western coast in the intervening days, though it disappeared from international tracking