25MAR

Iran cluster warhead hits three cities

2 min read

04:20UTC

The first confirmed cluster-warhead ballistic missile in this conflict turned three cities into area targets on the same day Israel's missile shield neared zero.

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ConflictDeveloping

Key takeaway

Iran is matching new weapons to Israel's defence gap, turning each missile into an area threat.

A ballistic missile carrying a cluster-bomb warhead struck central Israel on 31 March, scattering submunitions across Bnei Brak, Ramat Gan, and Petah Tikva. ¹ Six people were lightly injured. It was the first confirmed use of a cluster warhead on a ballistic missile in this conflict.

Cluster munitions scatter bomblets across a wide area. Against urban targets, they bypass the point-defence logic of interceptors: even a successful interception may not catch every submunition. The tactical shift suggests Iran is adapting to the interception window that remains before Arrow-3 stocks run out entirely. The USS Tripoli arrived days ago with 3,500 Marines , confirming that Tehran's intelligence services have demonstrated awareness of coalition planning. The cluster warhead's timing, coinciding with RUSI's projected Arrow-3 exhaustion, may reflect similar intelligence-driven calibration.

The three cities hit sit in the Greater Tel Aviv area, the densest urban corridor in Israel. If cluster warheads become standard payload on Iranian medium-range missiles, each launch becomes an area-wide threat rather than a single-point strike. The multiplication effect on civilian risk is substantial. Israel's 6,131 hospitalisations since 28 February already exceed total casualties from the entire 2006 Lebanon War. Undefended cluster warhead strikes would accelerate that count sharply.

Deep Analysis

In plain English

A cluster bomb is a weapon that opens in mid-air and releases dozens or hundreds of smaller bomblets over a wide area, rather than hitting one point. Iran put this type of warhead on a ballistic missile and fired it at central Israel for the first time. Six people were lightly injured this time. The worry is what happens when Israel's missile defence system, which intercepts incoming missiles, runs out of interceptors. RUSI projected that might happen by end of March. If the shield is exhausted and these area-effect weapons keep arriving, they land across entire city blocks rather than one building. That changes the casualty risk from dozens to potentially hundreds per strike.

Deep Analysis

Root Causes

GPS jamming across both Hormuz and Bab al-Mandeb has degraded missile accuracy for both sides. Iran's shift to cluster warheads bypasses the precision problem: area-effect weapons achieve their tactical purpose without requiring a direct hit.

Arrow-3 depletion creates a window of opportunity. Against an undefended target, even a conventional warhead lands with certainty. A cluster warhead against a partially defended target increases the probability that at least some submunitions reach civilians even if the main body is intercepted. This is military adaptation to a specific defence gap rather than an arbitrary escalation.

Iran's IRGC Aerospace Force has faced internal criticism over mismanagement and near-suicidal launch conditions. Switching to a weapon that does not require precision reduces the operational demand on crews while maintaining psychological pressure on Israeli urban populations.

What could happen next?

Risk
If cluster warheads become standard Iranian payload, each missile launch becomes an area-wide threat rather than a single-point strike, multiplying civilian casualty risk in any city targeted.
Immediate · 0.8
Consequence
Even partially successful interceptions may not catch all submunitions, reducing the practical effectiveness of remaining missile defence assets.
Immediate · 0.85
Precedent
First confirmed use of cluster warheads on ballistic missiles in this conflict establishes a qualitative threshold that may prompt Israeli or US pressure for expanded rules of engagement.
Short term · 0.7
Risk
Post-conflict unexploded submunitions in urban Israeli areas will cause civilian casualties for years after any ceasefire.
Long term · 0.9

Source Landscape

This story draws on centre-left-leaning sources from Israel

Israel

Primary parallel: US use of cluster munitions in the 2003 Iraq invasion and Israeli use in the 2006 Lebanon War both generated significant post-conflict civilian casualties from unexploded bomblets. In south Lebanon, UNICEF documented 1 million unexploded submunitions covering 45 sq km after 2006. Urban use dramatically amplifies this risk.

Counter-parallel: Iraqi Scud use against Israeli cities in 1991 employed conventional warheads and did not escalate to area-effect weapons. Israel absorbed the strikes without retaliating directly. That restraint option is functionally unavailable with cluster warheads given the expanded civilian risk profile.

Consensus view: RUSI's Justin Bronk and Chatham House's Emily Hawthorne both assess the cluster warhead as a doctrinal escalation. Iran is compensating for GPS jamming degrading missile accuracy by switching to area-effect weapons that do not require precision. The timing, coinciding with projected Arrow-3 exhaustion, suggests deliberate calibration rather than operational opportunism.

Counter-view: Iranian military analyst Hamid Mousavi argues this reflects legitimate military doctrine under duress: cluster munitions are not banned under international law for non-signatories to the Convention on Cluster Munitions. Neither Iran nor the US are signatories. Tehran frames it as proportionate response to bunker-busters on civilian-adjacent ammunition depots.

Key tension: Whether this establishes a new Iranian standard payload for all future launches, or remains a one-off test ahead of confirmed Arrow-3 exhaustion.

Sources:Times of Israel

Mentions:Arrow-3 →RUSI →Lebanon →USS Tripoli →Bnei Brak →Ramat Gan →

First Reported In

Update #53 · Trump drops Hormuz goal; toll becomes law

Times of Israel· 31 Mar 2026

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Causes and effects

Caused by

10,000 targets struck; 92% of navy gone

Iran's cluster-warhead missile launch against Israeli cities is a direct retaliatory escalation following the overnight Isfahan bunker-buster strikes.

Occurred 27 Mar 2026

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This Event

Iran cluster warhead hits three cities

Cluster warheads on ballistic missiles shift the threat from single-point strikes to area-wide civilian danger, arriving as upper-tier interceptors approach exhaustion.

Different Perspectives

Gulf shipping and insurance markets

With Hormuz and Bab el-Mandeb both hostile at once, war-risk underwriters face their first dual-chokepoint pricing problem; the rerouting hedge that absorbed one closure is gone for Israeli-linked hulls. Any deal that reopens Hormuz without a Houthi stand-down clause delivers only partial shipping relief.

Russia and China

Russia and China met IAEA chief Grossi jointly in Geneva on 5 June to coordinate an advance blocking position against Washington's censure resolution, the first documented instance of proactive pre-session obstruction rather than reactive post-vote dissent. Beijing's move came four days after OFAC designated Shanghai Qianye Energy under Iran energy sanctions.

Saudi Arabia

Saudi Arabia was left out of the emergency $4.01 billion Patriot waiver Qatar received on 2 May as its own PAC-3 stocks ran near-empty from intercepting Iranian salvoes over Aramco facilities. Riyadh is on a standard 18-month FMS queue behind a production line booked through 2030, with no equivalent priority to Qatar's Al Udeid basing role.

Houthis (Ansar Allah)

The Houthis declared a complete ban on Israeli Red Sea navigation on 8 June and struck Jaffa, their first attack on Israeli territory since April, seven days after the Tasnim authorisation to activate other fronts including Bab el-Mandeb. The declaration put both chokepoints under hostile authority simultaneously.

Iran

Iran agreed the 9 June mutual halt after the Mahshahr exchange and coordinated with Russia and China to block Washington's IAEA censure resolution, using the Board as a second front while the bilateral pause held on the military one. Tehran's acceptance of the Lebanon carve-out contradicts the linkage position it stated on 1 June.

Benjamin Netanyahu and the IDF

Israel struck the Karun Petrochemical plant at Mahshahr on 8 June over Trump's explicit objection, then agreed a halt with Iran the following day scoped on Israeli terms with Lebanon carved out. Netanyahu's posture is that the IDF will not accept Iranian missile factories as off-limits regardless of US diplomatic timelines.