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The Pentagon said Wednesday that last month’s US strikes on Iran have set back Tehran’s nuclear program by an estimated one to two years, according to new intelligence assessments.

“We believe, and certainly all of the intelligence that we’ve seen has led us to believe, that Iran’s facilities… have been completely obliterated,” Chief Pentagon Spokesman Sean Parnell said.

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Asked about the battle damage assessment of the strikes, Parnell added: “I think we’re thinking probably closer to two years, degraded their program by two years.”

The airstrikes took place on June 21, when seven US Air Force B-2 stealth bombers were refueled multiple times midair as they flew from their base in Missouri to targets in Iran.

The mission targeted three Iranian nuclear facilities: Fordow, Esfahan, and Natanz.

A total of 14 GBU-57 Massive Ordnance Penetrators (MOPs) -- 30,000-pound bunker-buster bombs -- were dropped during the strikes. In addition, a US guided-missile submarine launched over two dozen Tomahawk land-attack cruise missiles at Esfahan.

Following the unprecedented US bombardment of Iran’s nuclear infrastructure, conflicting reports emerged over the extent of the damage. Preliminary assessments leaked to the media from the Pentagon’s Defense Intelligence Agency (DIA) suggested that Iran may still retain much of its nuclear capability.

The DIA confirmed to Al Arabiya English that it had launched an investigation into the leak of the classified assessment, characterizing it as “preliminary” and of “low-confidence.” Officials from the Trump administration have rejected the leaked findings, insisting that the sites were “obliterated.”

Iran has also acknowledged that its nuclear facilities suffered “badly damaged” as a result of the strikes.

The operation, dubbed “Operation Midnight Hammer,” involved more than 125 aircraft, a guided-missile submarine, dozens of aerial refueling tankers, and other assets, making it the largest B-2 operational strike in US history, Chairman of the Joint Chiefs Gen. Dan Caine said. It was also the second-longest B-2 mission ever flown.

Read more: Trump says US military ‘obliterated’ three key nuclear sites in Iran, including Fordow