The US military strikes on three of Iran’s nuclear facilities last weekend did not destroy the core components of the country’s nuclear program and likely only set it back by months, according to an early US intelligence assessment that was described by seven people briefed on it.

The assessment, which has not been previously reported, was produced by the Defence Intelligence Agency, the Pentagon’s intelligence arm.

It is based on a battle damage assessment conducted by US Central Command in the aftermath of the US strikes, one of the sources said.

The analysis of the damage to the sites and the impact of the strikes on Iran’s nuclear ambitions is ongoing, and could change as more intelligence becomes available.

But the early findings are at odds with President Donald Trump’s repeated claims that the strikes “completely and totally obliterated” Iran’s nuclear enrichment facilities. Secretary of Defence Pete Hegseth also said on Sunday that Iran’s nuclear ambitions “have been obliterated.”

Two of the people familiar with the assessment said Iran’s stockpile of enriched uranium was not destroyed. One of the people said the centrifuges are largely “intact.” Another source said that the intelligence assessed enriched uranium was moved out of the sites prior to the US strikes.

“So the (DIA) assessment is that the US set them back maybe a few months, tops,” this person added.

The White House acknowledged the existence of the assessment but said they disagreed with it.

White House press secretary Karoline Leavitt told CNN in a statement: “This alleged assessment is flat-out wrong and was classified as ‘top secret’ but was still leaked to CNN by an anonymous, low-level loser in the intelligence community. The leaking of this alleged assessment is a clear attempt to demean President Trump, and discredit the brave fighter pilots who conducted a perfectly executed mission to obliterate Iran’s nuclear program. Everyone knows what happens when you drop fourteen 30,000 pound bombs perfectly on their targets: total obliteration.”

The US military has said the operation went as planned and that it was an “overwhelming success.”

It is still early for the US to have a comprehensive picture of the impact of the strikes, and none of the sources described how the DIA assessment compares to the view of other agencies in the intelligence community. The US is continuing to pick up intelligence, including from within Iran as they assess the damage.

Israel had been carrying out strikes on Iranian nuclear facilities for days leading up to the US military operation but claimed to need the US’ 14,000 kilogram bunker buster bombs to finish the job. While US B-2 bombers dropped over a dozen of the bombs on two of the nuclear facilities, the Fordow Fuel Enrichment plant and the Natanz Enrichment Complex, the bombs did not fully eliminate the sites’ centrifuges and highly enriched uranium, according to the people familiar with the assessment.

Instead, the impact to all three sites — Fordow, Natanz and Isfahan — was largely restricted to aboveground structures, which were severely damaged, the sources said. That includes the sites’ power infrastructure and some of the aboveground facilities used to turn uranium into metal for bomb-making.

The Israeli assessment of the impact of the US strikes also found less damage on Fordow than expected. However, Israeli officials believe the combination of US and Israeli military action on multiple nuclear sites set back the Iranian nuclear program by two years, assuming they are able to rebuild it unimpeded which Israel would not allow. But Israel had also stated publicly before the US military operation that Iran’s program had been set back by two years.

Hegseth also told CNN, “Based on everything we have seen — and I’ve seen it all — our bombing campaign obliterated Iran’s ability to create nuclear weapons. Our massive bombs hit exactly the right spot at each target and worked perfectly. The impact of those bombs is buried under a mountain of rubble in Iran; so anyone who says the bombs were not devastating is just trying to undermine the President and the successful mission.”

On Tuesday morning, Trump repeated his belief the damage from the strikes was significant.

“I think it’s been completely demolished,” he said, adding, “Those pilots hit their targets. Those targets were obliterated, and the pilots should be given credit.”

Asked about the possibility of Iran rebuilding its nuclear program, Trump responded, “That place is under rock. That place is demolished.”

While Trump and Hegseth have been bullish about the success of the strikes, Chairman of the Joint Chiefs of Staff Dan Caine said Sunday that while the damage assessment was still ongoing it would be “way too early” to comment on whether Iran still retains some nuclear capabilities.

Republican politician Michael McCaul, the chairman emeritus of the House Foreign Affairs Committee, would not echo Trump’s claims that the Iranian program had been “obliterated” when pressed by CNN on Tuesday.

“I’ve been briefed on this plan in the past, and it was never meant to completely destroy the nuclear facilities, but rather cause significant damage,” McCaul told CNN, referring to the US military plans to strike Iranian nuclear facilities. “But it was always known to be a temporary setback.”

Jeffrey Lewis, a weapons expert and professor at the Middlebury Institute of International Studies who has closely reviewed commercial satellite imagery of the strike sites, agreed with the assessment that the attacks do not appear to have ended Iran’s nuclear program.

“The ceasefire came without either Israel or the United States being able to destroy several key underground nuclear facilities, including near Natanz, Isfahan and Parchin,” Lewis said, referring to the ceasefire between Israel and Iran that Trump announced on Monday. Parchin is a separate nuclear complex near Tehran.

“These facilities could serve as the basis for the rapid reconstitution of Iran’s nuclear program.”

Earlier on Tuesday, classified briefings for both the House and Senate on the operation were cancelled.

The all-Senate briefing has been moved to Thursday, according to two sources familiar with the matter.

Two separate sources familiar told CNN the briefing for all House politicians has also been postponed. It was not immediately clear why it was delayed or when it would be rescheduled.

Democratic politician Pat Ryan of New York said on X on Tuesday that “Trump just cancelled a classified House briefing on the Iran strikes with zero explanation. The real reason? He claims he destroyed ‘all nuclear facilities and capability;’ his team knows they can’t back up his bluster and BS.”

As CNN has reported, there have long been questions about whether the US’ bunker-buster bombs, known as Massive Ordnance Penetrators, would be able to fully destroy Iran’s highly fortified nuclear sites that are buried deep underground — particularly at Fordow and Isfahan, Iran’s largest nuclear research complex.

Notably, the US struck Isfahan with Tomahawk missiles launched from a submarine instead of a bunker-buster bomb. That is because there was an understanding that the bomb would likely not successfully penetrate Isfahan’s lower levels, which are buried even deeper than Fordow, one of the sources said.

US officials believe Iran also maintains secret nuclear facilities that were not targeted in the strike and remain operational, according to two sources familiar with the matter.