Iran blacklists 45 tankers over Strait of Hormuz rules amid fresh US sanctions threatIran has blacklisted 45 tankers for allegedly violating its rules for crossing the Strait of Hormuz and warned that vessels conducting ship-to-ship transfers with them could also face action, escalating tensions over the key waterway nearly six months into the war.The Persian Gulf Strait Authority, a new body set up by Iran to manage the strait, said in an X post late on Sunday that the vessels could be fined, detained and have their cargoes confiscated.The list includes very large crude carriers, liquefied natural gas and liquefied petroleum gas tankers, and clean product vessels. Some are owned by the UAE's ADNOC Logistics and Shipping (ADNOC L&S), ADNOC subsidiary Navig8 Tankers and Saudi Arabia's national shipping carrier Bahri. Ships owned by Klaveness Ship Management, Stolt Tankers and South Korea's Sinokor are also included, according to Reuters.Which vessels are on Iran's blacklist?Kiku — IMO 9329796Mubaraz — IMO 9074626Minoan Pioneer — IMO 9471630Hafeet — IMO 9928009Al Rekayyat — IMO 9397339Wedyan — IMO 9524970Cyprus Prosperity — IMO 9595216Al Rawdah — IMO 9734513Rasheeda — IMO 9443413Lebrethah — IMO 9976927Lila Vadinar — IMO 9324100Maha Roos — IMO 9231004Gfs Galaxy — IMO 9401271Al Bahyah — IMO 9937799Mombasa B — IMO 9739501Stolt Magnesium — IMO 9739317Al Watan — IMO 9615030Navig8 Messi — IMO 9482859Singapore Prosperity — IMO 9419967Disha — IMO 9250713Gaslog Shanghai — IMO 9600528Lubna — IMO 9489065Hazi 1 — IMO 7802598Ryujin — IMO 8206818Anna Barbara — IMO 9407500Sunbird Arrow — IMO 9323821Minoan Dignity — IMO 9294484Maria — IMO 9917828Kavomaleas — IMO 1042823Mardan — IMO 9360453Sweden Prosperity — IMO 9588392Jarnain — IMO 9823546Kaifan — IMO 9656046Nissos Kea — IMO 9920758Rotterdam Energy — IMO 9508859Al Hamra — IMO 9074640Umm Al Ashtan — IMO 9074652Marigold Lng — IMO 9230062Banastar — IMO 9228045Navara — IMO 9241798Nissos Heraclea — IMO 9419618Blue Star 1 — IMO 9215115Ashley — IMO 9258464Mraweh — IMO 9074638Al Lulu — IMO 9583627Iran warns of harsh response to US sanctionsThe authority said ships involved in transfers with the blacklisted vessels could also be added to the list. It did not specify which rules had been breached. Iran has previously said shipowners should obtain clearance to transit the strait and pay for security and other services.The warning came days after the US threatened Iran with "the toughest sanctions in history". Iran's Foreign Ministry spokesperson Esmail Baghaei warned of a harsh response.“Any escalation of this situation will undoubtedly bring about consequences,” Esmail Baghaei said. “Our hands are not tied.”Iran's new top security official said support for the sanctions by any country would be considered an "act of war".Hormuz remains chokedThe US has imposed a naval blockade against Iran-related shipping. Before the conflict disrupted tanker traffic, the Gulf supplied about 20% of the world's daily crude oil and liquefied natural gas.Iran has said reopening the strait would require lifting the US blockade, withdrawing US forces from the region and reparations for war damage. It has also held talks with Oman on jointly managing the waterway.US-coordinated efforts to move tankers through the strait to fill supertankers waiting outside have helped restore some exports.US Energy Secretary Chris Wright said on X that the "7-day average of oil leaving the Strait is over 8 million barrels a day. Make no mistake, thanks to the U.S. Navy, oil is flowing through the Strait of Hormuz."Iran's currency hit a record low on Monday ahead of the expected US announcement. ADNOC declined to comment, while other shipping firms did not immediately respond to Reuters' requests for comment.