Dominican flag state officials are trying to establish the whereabouts of a suezmax tanker previously under arrest in the United Arab Emirates.
The 151,000-dwt Gulf Sky (built 1998) hit the headlines earlier this year following its alleged sale to an individual sanctioned by the US over links to Iranian trading.
The crew then contacted UK charity Human Rights at Sea (HRAS) in May over their lack of supplies and wages while at anchor in Khor Fakkan.