Euronav is investigating claims that one of its tankers was preparing to receive a cargo of sanctioned Iranian crude in a ship-to-ship transfer off the coast of Malaysia.

Campaign group United Against Nuclear Iran (UANI) told Euronav on Tuesday that its 441,600-dwt Oceania (built 2003) was alongside a Vietnam-flag vessel in the Malacca Strait that appeared to have loaded Iranian crude while its AIS was switched off in February.