An LPG carrier, its manager and a second ship manager with eight ships in its stead have been sanctioned by the US as it continues to crack down on Iranian petrochemical trading networks.

The US Treasury Department’s Office of Foreign Assets Control on Thursday announced sanctions against 10 companies doing business with two entities already on its blacklist: Triliance Petrochemical and Persian Gulf Petrochemical Industries Commercial.

Among them were WS Shipping, a Qingdao-based ship manager responsible for a mix of tankers and gas carriers, Dubai’s Virgo Marine and its 35,454-cbm Gas Allure (built 1997).