March 3, 2026 — Day 4 of Operation Epic Fury — was the day the war’s logic became irreversible. Eleven events were documented for the day. Three of them changed the strategic picture in ways that reached beyond the battlefield.

Israel Strikes Iran’s Succession Process

In the evening, Israel struck the Assembly of Experts building in Qom while the 88-member clerical body was in emergency session selecting a successor to the slain Supreme Leader Ali Khamenei. The votes had been cast before the strike; the count was disrupted but the process was not stopped. Iran stated the building hit was an older auxiliary structure and that members had been evacuated.

The strategic logic was explicit: Israel was not just targeting military infrastructure but Iran’s constitutional machinery — signaling that no institution, including the body responsible for selecting the next Supreme Leader, was off-limits.

It did not work. Mojtaba Khamenei — the Supreme Leader’s son — was announced as successor the following day. Reports indicated the IRGC had pressured the Assembly toward dynastic continuity as a wartime stability measure. The strike hardened the succession rather than derailing it.

The Strait Closes. LNG Stops.

IRGC Commander Ebrahim Jabari formally declared the Strait of Hormuz closed: “If anyone tries to pass, the heroes of the Revolutionary Guard will set those ships ablaze.” This formalized what had already been happening — tanker traffic had fallen 70–80% since March 1 as private war-risk insurance became unavailable.

The Strait carries approximately 20% of the world’s daily oil supply.

The same day, QatarEnergy halted all LNG production at the Ras Laffan Industrial City following Iranian attacks on Qatar. Ras Laffan supplies roughly 20% of global LNG.

Twenty percent of oil. Twenty percent of LNG. Both disrupted simultaneously on Day 4.

Trump responded by announcing that the US International Development Finance Corporation would provide political risk insurance for Gulf maritime trade and that the Navy would escort tankers through Hormuz “if necessary.” CNN later reported that US Navy officials told the shipping industry privately they lacked the capacity for individual escorts. The policy announcement and the operational reality diverged immediately.

A Ground War Opens in Lebanon

Israeli Defense Minister Katz and Prime Minister Netanyahu authorized the IDF 91st Division to begin a ground incursion into southern Lebanon. Troops entered at least five villages including Kfar Kila, Houla, Kfar Shouba, Yaroun, and Khiam. The Lebanese Army withdrew from seven forward positions before the advance. Over 30,000 people were displaced.

This reopened a ground front that had been closed since the November 2024 ceasefire — now without the diplomatic context that ended the previous round. Hezbollah had fired the first shot on March 1; by March 3 it was deploying drone swarms rather than rockets. At 0500 local time, a coordinated swarm targeted radar sites and control rooms at Ramat David Airbase in northern Israel — the most sophisticated Hezbollah strike of the conflict to date.

The Rest of Day 4

Al Udeid hit. An Iranian ballistic missile penetrated Qatari and US defenses and struck Al Udeid Air Base — the largest US military installation in the Middle East and CENTCOM’s forward headquarters. A second missile was intercepted. Planet Labs satellite imagery confirmed structural damage to the AN/FPS-132 early-warning radar at the adjacent Umm Dahal site. No casualties.

US Embassy Riyadh attacked. Two drones struck the embassy compound in Riyadh’s Diplomatic Quarter; the building was empty. Saudi air defenses intercepted four additional drones. Fire was extinguished. No casualties. The US Embassy issued a shelter-in-place advisory for American citizens across Saudi Arabia.

Minab school funeral. A mass funeral was held in Minab, Hormozgan Province for approximately 175 schoolgirls killed in a strike on February 28 — the opening day of the war. Trump claimed in a Fox News interview that the bombing was “done by Iran.” NBC News reported US military forces were targeting the area. Middle East Eye published an exclusive claiming “double-tap” strikes. No definitive forensic attribution was established. Senator Murphy called it “unforgivable” regardless of origin.

Iran’s missile campaign continues. Twelve Israeli civilians were killed in multiple Iranian ballistic missile barrages, with a direct hit on Ramat Gan causing severe residential damage. Iran had fired 119 attack waves at Israel since February 28. The IDF claimed 300 Iranian ballistic missile launchers had been destroyed — yet the missiles kept coming.

Infrastructure. Satellite imagery confirmed the destruction of at least seven buildings at the Dezful Missile Base in Khuzestan Province, and strikes on Parchin Military Complex’s underground facility southeast of Tehran. At Bushehr Airport, an Iran Air Airbus A319 (EP-IEP) parked since February 28 was destroyed on the apron. Rosatom announced the evacuation of non-essential personnel from the Bushehr Nuclear Power Plant — 12 km from the strikes.

What Day 4 Established

The war entered its fourth day having simultaneously disrupted global energy supply chains, opened a Lebanon ground front, struck Iran’s constitutional succession process, and hit the largest US forward base in the region. Each of these would have been a defining event in any prior conflict. On March 3 they were all one day’s news.

The IRIS Dena — an Iranian Navy frigate returning from a naval exercise in India — was sunk by a US submarine torpedo in the Indian Ocean off Sri Lanka. All sources date the confirmation to March 4, when the Pentagon released its statement. That story belongs to the next entry.

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Events documented on the Iran War Map. Sources and methodology in the research notes.