The ultimatum, made just a day after the US leader said he was considering “winding down” military operations after three weeks of war, came as the key oil passage remained effectively closed and thousands more American Marines headed to the Middle East.
Trump wrote on Truth Social that the US would “hit and obliterate” Iranian power plants — “starting with the biggest one first” — if Tehran did not fully reopen the strait within 48 hours, or 23:44 GMT on Monday, according to the time of his post.
Foreign Minister Abbas Araghchi said Tehran had imposed restrictions only on vessels from countries involved in attacks against Iran, and would assist others that stayed out of the conflict.
In response to Trump’s threat, Iran’s army said it will target energy, desalination infrastructure “belonging to the US and the regime in the region,” according to the Fars news agency.
Trump’s ultimatum Saturday landed hours after two Iranian missiles struck southern Israel, injuring more than 100 people in the most destructive attack since the war began. Israeli Prime Minister Benjamin Netanyahu vowed to retaliate “on all fronts.”
The strikes, which slipped through Israel’s missile defence systems, tore open the facades of residential buildings and carved craters into the ground.
First responders said 84 people were injured in the town of Arad, 10 of them seriously. Hours earlier, 33 were wounded in nearby Dimona, where AFPTV footage showed a large hole gouged into the ground next to piles of rubble and twisted metal.
Dimona hosts a facility widely believed to be the site of the Middle East’s only nuclear arsenal, although Israel has never admitted to possessing nuclear weapons.
The Israeli army told AFP there had been a “direct missile hit on a building” in Dimona, with casualties reported at multiple sites, including a 10-year-old boy in serious condition with shrapnel wounds.
In Arad, emergency workers combed through the rubble of heavily damaged buildings.
Netanyahu vowed to continue striking Iran after what he called a “very difficult evening”, and hours later, the Israeli military said its forces launched a wave of strikes on Tehran.
Iran said the targeting of Dimona was retaliation for Israeli strikes on its Natanz nuclear facility, with the Islamic Revolutionary Guard Corps (IRGC) saying forces also targeted other southern Israeli towns as well as military sites in Kuwait and the UAE.
Following the Natanz attack, UN nuclear watchdog chief Rafael Grossi reiterated his call for “military restraint to avoid any risk of a nuclear accident.”
The Natanz facility hosts underground centrifuges used to enrich uranium for Iran’s disputed nuclear programme and sustained damage in the June 2025 war.
