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US did not use bunker-buster bombs on one of Iran’s nuclear sites, top general tells lawmakers, citing depth of the target

  • The top US general informed senators that during last weekend's strikes, the military refrained from deploying its largest bunker-busting weapons on Iran’s heavily fortified Isfahan nuclear facility because the site is located too deep underground for such bombs to be effective.
  • General Dan Caine explained the bombs would likely not have been effective given the site's depth, which reportedly stores nearly 60% of Iran's enriched uranium stockpile vital for nuclear weapons.
  • US B-2 bombers targeted the Fordow and Natanz nuclear facilities with more than twelve bunker-busting bombs, while a US submarine launched Tomahawk cruise missiles against the Isfahan site.
  • Democratic Senator Chris Murphy said some Iranian nuclear capabilities remain unreachable underground and the strikes caused damage but likely only delayed Iran's program by months, not years.
  • Republican lawmakers recognized that the US military actions might have left some of Iran’s nuclear materials intact, while Iran’s Foreign Minister Araghchi affirmed there are no intentions to initiate new talks, highlighting ongoing diplomatic friction.
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Lean Right

The much-publicized 13-ton bunker-busting bombs that the US dropped on Iran's nuclear facilities were not used against the deepest of them, according to CNN. The reason: The bombs had insufficient effect.

·Stockholm, Sweden
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Lean Right

For the Joint Chief of Staff, the United States did not use GBU-57 bombs against Ispahan as this site, which would host 60% of Iran's reserves, would be too deep buried to be reached.

·Paris, France
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Lean Left

The United States has spared Isfahan, one of the country's largest nuclear facilities, during its attacks on Iran's nuclear facilities. The chairman of the US Joint Chiefs of Staff, General Dan Caine, told senators on Thursday that this is because the nuclear facility is so deep underground that US bunker-busting bombs would not be able to damage it.

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globalsecurityreview.com broke the news in on Friday, June 27, 2025.
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