Washington (AP) - The US has sanctioned Iranian oil tanker Adrian Darya-1 and the ship's captain. As a next step, the US government could also impose sanctions on harbors or companies that engage in business with the supertanker. According to US data, the freighter is in the service of the Iranian Revolutionary Guards, which are classified by Washington as a terrorist organization. The ship has been in the Mediterranean Sea since mid-August and has not been able to call at any port - not least due to pressure from the US government.