The IRGC Navy says two supertankers were immobilised by a "violent explosion" on the night of Wednesday 11 November while using a southern route through the Strait of Hormuz that it calls unauthorised.
In a statement on Thursday, reported by AFP via CBS News, the IRGC said the tankers were carrying "a combined total of over four million barrels of oil, which are now ablaze". It called the incident an "accident" without saying what kind. It blamed it on "the blind trust placed in the aggressive American military".
Iranian state media later said the tankers "exploded after hitting naval mines" and showed video footage it said was of the incidents, the Deccan Herald reports, citing AFP.
This is a separate incident from the IRGC's earlier claim that two tankers hit mines on Tuesday night while under US jet escort.
Fact check: The mine account conflicts with the US military, which recently claimed all mines had been cleared from the strait. Tehran has often said ships struck mines. In several earlier cases, UKMTO said tankers were struck by unknown projectiles. There is no independent or US confirmation of Wednesday night's incident.