The IRGC Navy said in a statement released late Sunday / early Monday that the tanker was attempting to leave the strategic waterway, had switched off all its positioning and navigation systems from the start of its voyage, and tried to use what Tehran calls an unauthorized southern route before hitting the mine.

The IRGC also released a video it said showed the incident, and warned that ships operating in the Strait of Hormuz and the Gulf with their navigation and identification systems switched off would face a firm and decisive response. The statement did not name the tanker, its flag, or its cargo, and gave no information on casualties or the extent of the damage — those details are the IRGC's claims and allegations, not independently verified facts.

The announcement follows IRGC claims on Saturday that two supertankers, each said to be carrying about two million barrels of crude, struck mines and caught fire in the strait; those vessels were also not identified and those claims were also not independently confirmed. Reuters noted Iran's report of another tanker hitting a mine in its Monday market coverage of Asian trading.

The Strait of Hormuz is one of the world's most important energy routes, normally carrying about one-fifth of global oil consumption.

Sources: Anadolu Agency (via Iran's semi-official Fars News Agency, reporting the IRGC Navy statement), Times of Israel (via FXStreet), Reuters, and the IRGC Navy statement reported by Press TV.