JERUSALEM – Iran fired missiles into the southern Israeli cities of Dimona and Arad on Sunday, March 22, 2026, shattering buildings and injuring dozens, as U.S. President Donald Trump warned Tehran to fully reopen the Strait of Hormuz within 48 hours or face strikes on its power infrastructure.
The dual developments point to a sharp escalation at the start of the conflict’s fourth week, with Israel acknowledging its air defenses failed to stop the incoming missiles near the country’s main nuclear research center in the Negev desert.
Israel’s military said missiles struck Dimona, about 20km west of the nuclear research center, and Arad, roughly 35km to the north. Footage from Israel’s emergency service showed a large crater next to what appeared to be apartment buildings with outer walls sheared away. Rescue workers reported widespread damage across at least 10 apartment buildings in Arad, three of them badly damaged and at risk of collapse, with at least 64 people taken to hospitals. “This is a very difficult evening,” Israeli Prime Minister Benjamin Netanyahu said, adding that more emergency crews were being sent.
Washington’s 48-hour ultimatum over the Strait of Hormuz
Trump, spending the weekend in Florida, issued an online ultimatum giving Iran 48 hours to fully open the Strait of Hormuz or face a new round of U.S. attacks, saying the United States would “obliterate” Iranian power plants. In a separate post, he added that the U.S. would destroy “various POWER PLANTS, STARTING WITH THE BIGGEST ONE FIRST!”
“various POWER PLANTS, STARTING WITH THE BIGGEST ONE FIRST!”
The warning effectively sets a deadline on Iranian authorities to restore navigation through the narrow waterway, which connects Gulf oil exporters to global markets and has been repeatedly disrupted since the conflict began. About one-fifth of the world’s traded oil typically flows through the strait, and prices have spiked sharply in recent days as insurers raise premiums and shippers divert vessels.
Diplomats noted that the ultimatum comes against the backdrop of long‑standing U.S. commitments to maintain freedom of navigation in international chokepoints such as Hormuz, principles that underpin the UN Convention on the Law of the Sea and wider maritime security norms. Gulf governments, already coordinating naval patrols and air defenses, are now weighing how far to align publicly with Washington’s deadline while trying to avert a region‑wide economic shock.
Sequence of strikes: Natanz hit earlier; IAEA assessing
Iran’s missile fire into Israel came after Tehran’s main nuclear enrichment site at Natanz was hit earlier on March 22. Israel earlier denied responsibility for the strike on Natanz, located nearly 220km southeast of Tehran. The Iranian judiciary’s official news agency, Mizan, said there was “no leakage.”
The International Atomic Energy Agency (IAEA) said on X that it was looking into the strike. The agency also noted that the bulk of Iran’s estimated 440kg of enriched uranium is at a different site, beneath the rubble at the Isfahan facility. The Pentagon declined to comment on the Natanz incident, which was previously targeted in the first week of the current war and in a separate 12‑day conflict in June. Russian Foreign Ministry spokesperson Maria Zakharova warned such strikes posed a “real risk of catastrophic disaster throughout the Middle East.”
Diplomatic sources said the IAEA’s assessment will feed directly into the governing Board of Governors’ ongoing oversight of Iran’s nuclear activities, and could influence whether board members press for additional inspections, emergency briefings or referrals to the UN Security Council if they conclude safeguards are at risk. The episode also revives long‑running disputes over the security of nuclear installations in wartime and the obligations of states under the Convention on the Physical Protection of Nuclear Material.
Air-defense breach near Israel’s nuclear center
The Israeli military said it was not able to intercept the missiles that hit in the Dimona-Arad area, the first time Iranian missiles have penetrated air defenses around the nuclear site. “If the Israeli regime is unable to intercept missiles in the heavily protected Dimona area, it is, operationally, a sign of entering a new phase of the battle,” Iran’s Parliament Speaker Mohammad Bagher Ghalibaf said on X. Israel is widely believed to be the only Middle Eastern nation with nuclear weapons, though its leaders neither confirm nor deny their existence. The UN nuclear watchdog said on X it had not received reports of damage to the Israeli center or abnormal radiation levels.
Israeli officials said a formal review of the performance of air-defense systems in the south was underway, including how the integrated network around the sensitive facility failed to intercept incoming fire. Any findings are expected to feed into cabinet‑level discussions on civil defense, shelter infrastructure and whether to seek additional missile‑defense deployments from the United States and European partners.
Diego Garcia claim fuels debate over range and capability
UK officials said a strike that targeted the joint UK-U.S. military base on Diego Garcia on Saturday, March 21, 2026, was unsuccessful, describing Iran as “lashing out across the region.” It remains unclear how close the missiles came to the island. Iran has previously asserted it limits missile range to below 2,000km. Some military experts suggested Tehran may have used a space launch vehicle for an improvised firing, while Israel’s army chief said Iran had fired “a two-stage intercontinental ballistic missile.” Iran did not issue a statement.
Britain has not participated in U.S.-Israeli attacks but has allowed U.S. bombers to use its bases to strike Iranian missile sites, and said bombers could use Diego Garcia to hit platforms used to target ships in the Strait of Hormuz. The reported attempt on Diego Garcia is likely to be scrutinized in NATO and EU defense forums, where officials have been debating how far Iran’s missile and space programs now extend beyond previously declared ranges.
Security of shipping and military deployments
As pressure mounted to restore commercial traffic, the United Arab Emirates joined 21 other countries – including the UK, Germany, France and Japan – in expressing readiness to contribute to efforts to ensure safe passage through the Strait of Hormuz. Officials said discussions were underway about expanding existing maritime task forces and clarifying rules of engagement for any joint escorts of commercial tankers.
The U.S. administration said it was temporarily lifting sanctions on Iranian oil already loaded on ships as of Saturday, March 21, 2026, a measure that does not increase production but is intended to ease immediate supply concerns and encourage Iran not to target vessels carrying its own crude. Iran’s oil ministry responded that it “essentially has no crude oil left in floating storage.”
Admiral Brad Cooper, head of U.S. Central Command, said Iran’s ability to attack vessels on the strait had been “degraded,” and that 2,270kg bombs were dropped on an underground facility along Iran’s coast used to store anti-ship cruise missiles and mobile launchers. The United States is deploying three more amphibious assault ships and roughly 2,500 additional Marines to the Middle East, U.S. officials said, further reinforcing what has become one of the largest U.S. forward naval presences in the region in years.
Regional spillover and reported tolls
Gulf states reported additional incidents as the conflict widened. A missile alert sounded in Dubai, and Saudi Arabia said it downed 20 drones in its east, home to major oil installations.
Reported casualty and damage figures from authorities include:
– Iran: more than 1,500 dead, according to the state broadcaster citing the health ministry.
– Israel: 15 people killed by Iranian missiles; four additional deaths in the occupied West Bank.
– U.S.: at least 13 military personnel killed.
– Gulf nations: well over a dozen civilian deaths.
– Arad, Israel: at least 64 people hospitalized; damage across at least 10 apartment buildings, with three at risk of collapse.
Humanitarian agencies working with local authorities said hospitals across the region were under severe strain, with emergency rooms in southern Iran and southern Israel treating mass‑casualty inflows while also contending with intermittent power cuts and shortages of medical supplies. Governments have so far resisted calls for internationally monitored humanitarian corridors, arguing that the security situation remains too volatile.
Northern front: limited ground action in southern Lebanon
Israel’s military said it conducted a “targeted ground operation” in southern Lebanon, reporting at least four militants killed. Hezbollah said its fighters clashed with Israeli troops in the village of Khiam. According to the Lebanese government, Israeli strikes targeting Hezbollah have killed more than 1,000 people and displaced more than 1 million, and Hezbollah’s civilian assets have been targeted.
Security officials in Beirut warned that continued air and ground operations in the south risk overwhelming Lebanon’s already fragile state institutions, which are still reeling from years of economic crisis. UN peacekeepers monitoring the Blue Line have urged both sides to avoid steps that could draw the country into a full‑scale war, but acknowledge that cross‑border exchanges have become more intense and less predictable.
Key statements on March 22, 2026
– President Donald Trump warned the U.S. would “obliterate” Iranian power plants if the Strait of Hormuz is not fully opened within 48 hours.
– “The war is not close to ending,” Israel’s army chief, Gen. Eyal Zamir, said earlier on March 22.
– “If the Israeli regime is unable to intercept missiles in the heavily protected Dimona area, it is, operationally, a sign of entering a new phase of the battle,” Iran’s Parliament Speaker Mohammad Bagher Ghalibaf said on X.
– “Real risk of catastrophic disaster throughout the Middle East,” Russian Foreign Ministry spokesperson Maria Zakharova said of strikes on nuclear facilities.
– Iran’s Mizan news agency reported “no leakage” at Natanz.
– The IAEA said on X it had not received reports of damage to Israel’s nuclear center or abnormal radiation levels and was looking into the strike.
As governments weigh their next moves, diplomats say the coming 48 hours – the period defined by Washington’s ultimatum – will test not only Iran’s military calculus but also the capacity of existing multilateral frameworks, from maritime law to nuclear oversight, to contain a rapidly widening conflict without a clear path to negotiations.
