17OCT

Bunker-busters hit Isfahan depots

2 min read

17:43UTC

Heavy penetration munitions struck Iranian stores near Isfahan, with secondary explosions visible on video that Trump reshared.

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ConflictDeveloping

Key takeaway

Isfahan strikes destroyed ammunition stores but did not prevent Iran's same-day cluster warhead retaliation.

US forces dropped a high volume of 2,000-pound bunker-buster bombs on Iranian ammunition depots near Isfahan overnight on 30 to 31 March.⁠¹ Secondary explosions were confirmed on video. President Trump reportedly reshared the footage.

The strikes add to a campaign that had already exceeded 10,000 targets according to CENTCOM commander Admiral Brad Cooper five days earlier. Isfahan's depots hold conventional munitions that feed Iran's ballistic missile and drone operations. Destroying stockpiles degrades Iran's ability to sustain the current firing rate, but the third Bushehr strike within the reactor perimeter demonstrated that the air campaign has not altered Tehran's willingness to launch.

Iran's response came within hours. A ballistic missile carrying a cluster warhead struck three Israeli cities the same day. The sequence (bunker-busters, then retaliatory escalation with a new weapon type) mirrors a pattern established across multiple strike-retaliation cycles in this conflict. Each round introduces heavier ordnance on both sides.

Deep Analysis

In plain English

US planes dropped extremely heavy bombs, each weighing 2,000 pounds, on Iranian weapons storage sites near the city of Isfahan overnight. These 'bunker-busters' are designed to penetrate underground or reinforced structures before exploding. The secondary explosions visible on video confirmed ammunition was destroyed. But within hours, Iran fired a new type of missile at Israeli cities in retaliation. Destroying storage does not stop missiles already on their way. This strike-retaliation pattern has repeated multiple times throughout the war.

Deep Analysis

Root Causes

The Isfahan ammunition depots hold conventional munitions feeding Iran's ballistic missile and drone operations. Destroying stockpiles is a logical target within the stated objective of degrading Iran's military capacity, even after Hormuz reopening was privately abandoned as the primary goal.

The bunker-buster choice reflects intelligence that the depots were hardened or semi-underground. The 2,000-pound GBU-28 is the heaviest penetration munition in the US inventory. Deploying it at high volume signals that the target was assessed as both deeply protected and high-value. Secondary explosions confirm the assessment was correct.

Escalation

Each strike-retaliation cycle introduces heavier ordnance on both sides. The Isfahan bunker-busters prompted a cluster warhead within hours. At the current exchange rate, the next cycle could involve larger warheads or multiple simultaneous launches, especially if Israel's upper-tier defences are confirmed exhausted. The absence of any diplomatic off-ramp on the military track means the cycle has no natural stopping point.

What could happen next?

Consequence
Isfahan depot destruction degrades Iran's sustained firing rate but does not interrupt the current operational tempo within the same 24-hour window.
Immediate · 0.8
Risk
Each strike-retaliation cycle introduces heavier weapons on both sides, with the next Iranian response potentially targeting coalition bases directly.
Short term · 0.7
Consequence
Civilian casualty exposure in Iran rises as strikes extend into logistics infrastructure across population centres.
Short term · 0.75

Source Landscape

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

Israel

Primary parallel: Coalition strikes on Iraqi ammunition depots and missile sites in 2003 similarly degraded conventional capacity while failing to prevent sustained insurgent operations. Stockpile destruction succeeded tactically but did not alter the adversary's strategic willingness to continue.

Counter-parallel: The 1991 Gulf War's air campaign destroyed roughly 40% of Iraqi air defence in 72 hours, producing a genuine degradation of response capacity. The key difference is that Iran has demonstrated far greater ability to absorb strikes and continue firing than Iraq did in 1991.

Consensus view: IISS analysts note that destroying ammunition depots degrades the rate of fire but does not eliminate the capability. Iran's dispersed storage doctrine, adopted after the 2020 Soleimani assassination, means no single depot represents a strategic reserve.

Counter-view: Iranian military commentator Alireza Nader argues that the cluster warhead retaliation on the same day demonstrates Iran's operational resilience: the command to launch was given before the Isfahan depots were struck, not after. The sequence is coincidence, not evidence of reduced capability.

Key tension: Whether the cumulative effect of 10,000+ strikes across 32 days has meaningfully degraded Iran's launch tempo, or whether Tehran is conserving inventory for a decisive strike after Arrow-3 exhaustion.

Sources:Times of Israel

Mentions:Arrow-3 →Isfahan →CENTCOM (US Central Command) →Admiral Brad Cooper →Gulf War →

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

CENTCOM says US has struck 10,000 Iran targets

US bunker-buster strikes on Isfahan ammunition depots extend CENTCOM's campaign that already exceeded 10,000 declared targets.

Occurred 27 Mar 2026

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This Event

Bunker-busters hit Isfahan depots

The strikes extend CENTCOM's campaign past 10,000 declared targets and triggered Iran's cluster-warhead retaliation within hours.

Different Perspectives

Bulgarian government

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Radoslaw Sikorski

Poland's foreign minister challenged Elon Musk on X after SpaceX capped Ukraine's Starshield terminals on 14 October. Poland pays about $50m a year for Ukraine's Starlink subscriptions, so Warsaw speaks as the paying customer as well as the ally.

Andy Burnham

Burnham fast-tracked £10m of a £45m air-defence missile delivery when Zelenskyy visited London on 14 October, and his ministers are lobbying allies to ban maritime services for Russian liquefied natural gas. The measure targets insurers and shipowners, many of them in London, rather than the gas itself.

Ministry of External Affairs (India)

India's foreign ministry said after the 16 September House vote that New Delhi would take all necessary measures to protect its trade.

European Council

EU leaders on 15-16 October rejected a US idea to hand Washington the roughly €200bn of frozen Russian assets held in Europe, and Kaja Kallas said the decision belongs to Europeans. The same summit put off a decision on financing Ukraine, saying leaders "will revert to the issue in a timely manner".

Donald Trump

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Written with AI from Lowdown's published reporting. Not individually reviewed by an editor. Editorial standards.