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WASHINGTON: A powerful American bunker-busting bomb is the only weapon capable of destroying Iran’s deeply buried nuclear facilities, making it President Donald Trump’s weapon of choice if he chooses to militarily back Israel.

The GBU-57, a 30,000-pound (13,607 kg) warhead capable of penetrating 200 feet (61 meters) underground before exploding, is missing from Israel’s arsenal despite its stated goal of preventing Iran from building a nuclear bomb.

In less than a week, the Israeli army has taken out Iranian military commanders and damaged numerous surface installations, raising more questions than answers.

“The regime’s missile stockpiles, launchers, military bases, production facilities, nuclear scientists, military command and control has taken a very severe beating,” said Behnam Ben Taleblu, director of the Iran program at the Washington-based think tank Foundation for Defense of Democracies (FDD), a conservative-leaning group.

“But there are still outsized questions as to how efficacious of a strike Israel had against the beating hearts of Iran’s nuclear program,” Taleblu said.

The International Atomic Energy Agency (IAEA) has reported no damage at Fordo, a uranium enrichment plant south of Tehran. Unlike the Natanz and Isfahan sites in central Iran, Fordo is buried deep underground, beyond the reach of Israeli bombs.

“All eyes will be on Fordo, which is buried under about 300 feet of rock in central Iran,” Taleblu said.

Former US Army lieutenant general and Rand Corporation defense researcher Mark Schwartz insists that “only the United States has the conventional capacity” to destroy such a site.

And by “conventional capacity,” he means the non-nuclear GBU-57 bomb.

The US military says the GBU-57 – also named Massive Ordnance Penetrator – “is designed to penetrate up to 200 feet underground before exploding,” navigating through rock and concrete.

This differs from missiles or bombs that typically detonate their payload near or upon impact.

“To defeat these deeply buried targets, these weapons need to be designed with rather thick casings of steel, hardened steel, to sort of punch through these layers of rock,” said Masao Dahlgren, a fellow working on missile defense for the Center for Strategic and International Studies (CSIS), a Washington-based research center.

The 6.6-meter-long GBU-57 also has a specialized fuse because “you need an explosive that’s not going to immediately explode under that much shock and pressure,” Dahlgren said.

Design for this bomb began in the early 2000s, and an order for 20 units was placed with Boeing in 2009.

The only aircraft capable of deploying the GBU-57 is an American B-2 Bomber, a stealth aircraft.

Some of these bombers were deployed in early May on Diego Garcia, the site of a joint UK-US military base in the Indian Ocean, but were no longer visible by mid-June, according to AFP’s analysis of satellite imagery provided by Planet Labs.

With their long-range capabilities, B-2s departing from the United States “are able to fly all the way to the Middle East to do bombing runs. That’s been done before,” Dahlgren said.

Each B-2 can carry two GBU-57 bombs, and Schwartz said multiple bombs will likely be needed.

“They’re not going to just be one and done,” he said.

Schwartz added that the air superiority Israel has established over Iran reduces the risks faced by the B-2 bombers.

Such a US intervention would come with “a lot of political baggage for America,” Taleblu said, emphasizing that the bunker-buster bomb is not the only way to address Iran’s nuclear program.

Without the GBU-57 bombs, and short of a diplomatic solution, Taleblu said Israelis could attack access to underground complexes like Fordo by “trying to hit entrances, collapse what they can, cut electricity” and take other measures that have already been taken at Natanz.

JERUSALEM/WASHINGTON/DUBAI: Iran and Israel launched new missile strikes at each other on Wednesday as the air war between the two longtime enemies entered a sixth day despite a call from US President Donald Trump for Iran’s unconditional surrender.
The Israeli military said two barrages of Iranian missiles were launched toward Israel in the first two hours of Wednesday morning. Explosions were heard over Tel Aviv.
Israel told residents in the area of Tehran to evacuate so its air force could strike Iranian military installations. Iranian news websites said explosions were heard in Tehran and the city of Karaj west of the capital.
Trump warned on social media on Tuesday that US patience was wearing thin. While he said there was no intention to kill Iran’s leader “for now,” his comments suggested a more aggressive stance toward Iran as he weighs whether to deepen US involvement.
“We know exactly where the so-called ‘Supreme Leader’ is hiding,” he wrote on Truth Social, referring to Iran’s Ayatollah Ali Khamenei. “We are not going to take him out , at least not for now ... Our patience is wearing thin.”
Three minutes later Trump posted, “UNCONDITIONAL SURRENDER!“
A White House official said Trump spoke to Israeli Prime Minister Benjamin Netanyahu by phone on Tuesday.
Trump’s sometimes contradictory and cryptic messaging about the conflict between close US ally Israel and longtime foe Iran has deepened the uncertainty surrounding the crisis. His public comments have ranged from military threats to diplomatic overtures, not uncommon for a president known for an often erratic approach to foreign policy.
Britain’s leader Keir Starmer, speaking at the Group of Seven nations summit in Canada that Trump left early, said there was no indication the US was about to enter the conflict.
Trump met for 90 minutes with his National Security Council on Tuesday afternoon to discuss the conflict, a White House official said. Details were not immediately available.
The US is deploying more fighter aircraft to the Middle East and extending the deployment of other warplanes, three US officials told Reuters. The US has so far only taken defensive actions in the current conflict with Iran, including helping to shoot down missiles fired toward Israel.

Regional influence weakens
Khamenei’s main military and security advisers have been killed by Israeli strikes, hollowing out his inner circle and raising the risk of strategic errors, according to five people familiar with his decision-making process.
With Iranian leaders suffering their most dangerous security breach since the 1979 Islamic Revolution, the country’s cybersecurity command banned officials from using communications devices and mobile phones, Fars news agency reported.
Israel launched a “massive cyber war” against Iran’s digital infrastructure, Iranian media reported.
Ever since Iran-backed Hamas attacked Israel on October 7, 2023, and triggered the Gaza war, Khamenei’s regional influence has waned as Israel has pounded Iran’s proxies — from Hamas in Gaza to Hezbollah in Lebanon, the Houthis in Yemen and militias in Iraq. Iran’s close ally, Syria’s autocratic president Bashar Assad, has been ousted.
Israel launched its air war, its largest ever on Iran, on Friday after saying it had concluded the Islamic Republic was on the verge of developing a nuclear weapon.
Iran denies seeking nuclear weapons and has pointed to its right to nuclear technology for peaceful purposes, including enrichment, as a party to the international Non-Proliferation Treaty.
Israel, which is not a party to the NPT, is the only country in the Middle East believed to have nuclear weapons. Israel does not deny or confirm that.
Netanyahu has stressed that he will not back down until Iran’s nuclear development is disabled, while Trump says the Israeli assault could end if Iran agrees to strict curbs on enrichment.
Before Israel’s attack began, the 35-nation board of governors of the UN nuclear watchdog, the International Atomic Energy Agency, declared Iran in breach of its non-proliferation obligations for the first time in almost 20 years.
The IAEA said on Tuesday an Israeli strike directly hit the underground enrichment halls at the Natanz facility.
Israel says it now has control of Iranian airspace and intends to escalate the campaign in coming days.
But Israel will struggle to deal a knock-out blow to deeply buried nuclear sites like Fordow, which is dug beneath a mountain, without the US joining the attack.
Iranian officials have reported 224 deaths, mostly civilians, while Israel said 24 civilians had been killed. Residents of both countries have been evacuated or fled.
Global oil markets are on high alert following strikes on sites including the world’s biggest gas field, South Pars, shared by Iran and Qatar.