
Why would the US strike Iran and how?
US President Donald Trump's officials say he is considering a number of options when it comes to Iran, including a possible US strike on the country.
Trump initially distanced himself from Israel's surprise attack on Iran on Friday, but in recent days has hinted at greater American involvement, saying he wants something "much bigger" than a ceasefire.
He has also made it clear that the US wants to end Iran's nuclear capability.
A White House statement on Tuesday said: "President Donald J. Trump has never wavered in his stance that Iran cannot be allowed to have a nuclear weapon — a pledge he has made repeatedly, both in office and on the campaign trail."
The US has also sent more military aircraft and warships to the region.
ITV News looks at why the US might be considering a strike on Iran, what that would involve and what the consequences could be.
Nuclear sites
Trump is said to be warming to the idea of using US assets to disable Iran's nuclear programme, rather settling the issue through talks.
The biggest challenge to achieving that goal is the Fordow nuclear enrichment plant - which appears to have been built specifically to withstand airstrikes.
Fordow is Iran's second enrichment facility after Natanz, its main facility, which already has been targeted by Israeli airstrikes.
Fordow, is smaller than Natanz but in addition to being an estimated 80 meters (260 feet) under rock and soil, the site is reportedly protected by Iranian and Russian surface-to-air missile systems.
Despite those challenges, Israeli Prime Minister Benjamin Netanyahu has said the goal of attacking Iran was to eliminate its missile and nuclear programme - and officials say Fordow is key to that plan.
"This entire operation ... really has to be completed with the elimination of Fordow,' Yechiel Leiter, Israel's ambassador to the US, told Fox News on Friday.
Israel doesn't have the massive munition it would take to destroy Fordow, or the aircraft needed to deliver it.
Only the US does.
'Bunker-busting' bombs
Trump is reportedly deliberating whether to use America's GBU-57 "Massive Ordnance Penetrator' guided bombs to destroy Fordow, which is entombed below several hundred feet of concrete in a mountain.
These 30,000 bombs, known as 'bunker busters' were designed to destroy underground sites at the height of concerns a decade ago over Iran's nuclear programme.
The powerful GBU-57 uses its weight and sheer kinetic force to reach deeply buried targets — and then explode.
The US Air Force's B-2 Spirit stealth bomber is the only aircraft that can carry the GBU-57.
There are currently no B-2 bombers in the Middle East region.
If tapped for use, the B-2 bombers would have to make the 30-hour round trip from Whiteman Air Force Base in Missouri, refueling multiple times.
Consequences
Those calling for a US strike, say that a devastating, contained US military strike would destroy Iran's nuclear programme and remove an existential threat to Israel and national security risk for the United States.
However, opponents to the idea point to the probability of an Iranian response; the chaos that would result from a possible downfall of the Iranian regime and the further estabilisation of the entire Middle East region.
Iran's supreme leader on Wednesday warned that any military involvement by the Americans would cause "irreparable damage" to them, in recorded video aired by state TV.
Earlier that day, a spokesman for the Iranian foreign ministry said: "Any American intervention would be a recipe for an all-out war in the region."
In addition there is a risk of nuclear contamination.
The International Atomic Energy Agency has confirmed that Iran is producing highly enriched uranium at Fordow, raising the possibility that nuclear material could be released into the area if the GBU-57 A/B were used to hit the facility. However, Israeli strikes at another Iranian nuclear site, Natanz, on a centrifuge site have caused contamination only at the site itself, not the surrounding area, the IAEA has said.

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