Iran's elite Revolutionary Guards have said they had "complete control" of the Strait of Hormuz, a crucial chokepoint into the Gulf and one of the world's most vital shipping routes for energy.
"The Master of a tanker at anchor, reports witnessing and hearing a large explosion on the port side then seeing a small craft leave the vicinity" off the Gulf state's Mubarak Al-Kabeer area, UKMTO posted on X.
"There is oil in the water coming from a cargo tank which could have some environmental impact".
Kuwait's interior ministry said the blast happened "outside Kuwaiti territorial waters", at least 60 kilometres (37 miles) from Mubarak Al-Kabeer Port.
Chinese shipping giant Cosco, which operates one of the world's biggest oil tanker fleets, announced it was suspending services to and from Gulf countries from Wednesday, including Kuwait.
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