The United States has used its most elite stealth bombers and largest non-nuclear bombs in a massive coordinated strike on Iran’s nuclear facilities.

President Donald Trump confirmed the US had “completed our very successful attack on the three nuclear sites in Iran”, including Fordow, Natanz, and Esfahan on Saturday (Sunday AEST).

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Two sources familiar with the operation told CNN the United States used the GBU-57A/B Massive Ordnance Penetrator (MOP), also known as a “bunker buster,” in its strikes.

At least six B-2 Spirit bombers were deployed to attack Iran’s deeply buried Fordow nuclear site, dropping the 1.3-ton MOP bomb, a US official told CNN.

The official said a dozen MOP bombs were dropped on Fordow alone.

The GBU-57A/B is a 30,000-pound (13,600kg) bomb is packed with 6000 pounds of explosives, designed specifically for “reaching and destroying our adversaries’ weapons of mass destruction located in well-protected facilities,” according to a US Air Force fact sheet.

The bomb explodes twice — once on impact, and again up to 60 metres underground.

The B-2 Spirit is the only aircraft capable of carrying the MOP.

It’s the US Air Force’s most advanced stealth bomber.

Separately, Navy submarines launched 30 Tomahawk Land Attack Missiles (TLAMs) at nuclear sites in Natanz and Isfahan, the US official said.

A B-2 bomber also dropped two MOPs on Natanz, the official told CNN.

The specifics of the strike were first reported by The New York Times.

The B-2 is known for its flying wing design, radar-evading features and long-range capability.

It can carry a 40,000-pound payload and costs around $2 billion per aircraft.

Only 20 exist, all based at Whiteman Air Force Base in Missouri.

Fordow, Natanz, and Isfahan are the backbone of the Iranian nuclear program, according to Western intelligence.

Isfahan is a research base. It’s believed Iran was working towards the final step of putting weapons grade nuclear material into a war head for a nuclear weapon.

Natanz and Fordow are reportedly uranium enrichment facilities where centrifgues processed the radioavtice material.

The Fordow site is buried more than 90 metres underground inside a mountain.

Saturday’s mission is believed to be the first operational use of the MOP bomb.

With CNN