The Houthi movement in Yemen says it has struck a US merchant ship in the Red Sea in a fresh attack targeting commercial shipping.
It named the ship as the KOI, which it said was US-operated.
But industry journal Trade Winds quoted a source familiar with the situation as saying there was no such attack.
Maritime security firm Ambrey said a vessel operating south of Yemen’s port of Aden had reported an explosion on board but it did not name the ship.
Meanwhile, the US has launched new air strikes in Yemen, targeting 10 drones reportedly being set up to launch.
Reports show that the KOI is a Liberian-flagged container ship operated by UK-based Oceonix Services.
The same company’s fleet includes the oil tanker Marlin Luanda, which was damaged by a missile on Saturday.