International worries that the Trump Administration is sliding toward war with Iran flared into the open amid scepticism about its claims that the Islamic Republic poses a growing threat to the US and its allies in the Persian Gulf and beyond.

The US military today rebutted doubts expressed by a British general about such a threat. President Donald Trump denied a report that the Administration has updated plans to send more than 100,000 troops to counter Iran if necessary.

But Trump then stirred the controversy further by saying: "Would I do that? Absolutely."

Meanwhile, Iran's supreme leader has issued a veiled threat in the same speech in which he stated that "no one is seeking war," saying it wouldn't be difficult for the Islamic Republic to enrich uranium to weapons-grade levels, state media reported.

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Speaking Tuesday night, local time, in Tehran at an iftar, the traditional dinner Muslims have when breaking their daylong fast during the holy month of Ramadan, Ayatollah Ali Khamenei's reported comments first focused on him downplaying the chances of a wider conflict in the Middle East with America.

He reportedly told senior officials that his country won't negotiate with the United States, calling such talks "poison." But he also said, "Neither we, nor them is seeking war. They know that it is not to their benefit."

The US Embassy in Iraq says the State Department has ordered all non-essential, non-emergency government staff to leave the country right away amid escalating tensions with Iran.

The British general's remarks exposed international scepticism over the American military build-up in the Middle East, a legacy of the 2003 invasion of Iraq that was predicated on false intelligence.

US officials have not publicly provided any evidence to back up claims of an increased Iranian threat amid other signs of allied unease.

The US has ordered the USS Abraham Lincoln aircraft carrier strike group to the Gulf region, plus four B-52 bombers. Photo / AP
The US has ordered the USS Abraham Lincoln aircraft carrier strike group to the Gulf region, plus four B-52 bombers. Photo / AP

As tensions in the region started to surge, British Foreign Secretary Jeremy Hunt said his nation was worried about the risk of accidental conflict "with an escalation that is unintended really on either side".

Then Spain temporarily pulled one of its frigates from the US-led combat fleet heading toward the Strait of Hormuz.

That was followed by the unusual public challenge to the Trump Administration by the general.

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"No, there's been no increased threat from Iranian-backed forces in Iraq and Syria," said Major General Chris Ghika, a senior officer in the US-backed coalition fighting the Islamic State group.

Ghika, speaking in a video conference from coalition headquarters in Baghdad, told reporters at the Pentagon that the coalition monitors the presence of Iranian-backed forces "along with a whole range of others because that's the environment we're in".

But he added: "There are a substantial number of militia groups in Iraq and Syria, and we don't see any increased threat from any of them at this stage."

Iranian supreme leader Ayatollah Ali Khamenei reportedly told senior officials that his country won't negotiate with the United States, calling such talks
Iranian supreme leader Ayatollah Ali Khamenei reportedly told senior officials that his country won't negotiate with the United States, calling such talks "poison". Photo / AP

In a rare public rebuttal of an allied military officer, US Central Command said Ghika's remarks "run counter to the identified credible threats" from Iranian-backed forces in the Mideast.

In a written statement, Central Command said the coalition in Baghdad has increased the alert level for all service members in Iraq and Syria.

"As a result, (the coalition) is now at a high level of alert as we continue to closely monitor credible and possibly imminent threats to US forces in Iraq," the statement said.

At the White House, Trump, who has repeatedly argued for avoiding long-term conflicts in the Mideast, discounted a New York Times report that the US has updated plans that could send up to 120,000 troops to counter Iran if it attacked American forces.

"Would I do that? Absolutely," he told reporters. "But we have not planned for that. Hopefully we're not going to have to plan for that. If we did that, we'd send a hell of a lot more troops than that."

Reinforcing Trump's denial, Secretary of State Mike Pompeo said at a joint news conference in Sochi with Russian Foreign Minister Sergei Lavrov: "We fundamentally do not seek war with Iran."

A Trump Administration official said a recent small meeting of national security officials was not focused on a military response to Iran, but instead concentrated on a range of other policy options, including diplomacy and economic sanctions. The official spoke on condition of anonymity to discuss internal deliberations.

Two Saudi oil tankers and a Norwegian-flagged vessel were damaged in what Gulf officials describ as a
Two Saudi oil tankers and a Norwegian-flagged vessel were damaged in what Gulf officials describ as a "sabotage" attack off the coast of the United Arab Emirates. Photo / AP

Lavrov said Pompeo told him that a potential deployment of 120,000 US troops to the Mideast was only a "rumour".

Lavrov said the international community needs to focus on diplomacy with Iran, including on the potentially explosive issue of Iran's nuclear program, which is constrained by a US-brokered deal in 2015 that Trump has abandoned.

US Iran envoy Brian Hook told reporters traveling with Pompeo in Brussels that the Secretary of State shared intelligence on Iran with allies since "Europe shares our concerns about stability in the Gulf and the Middle East".

What we need is a period of calm to make sure that everyone understands what the other side is thinking. British Foreign Secretary Jeremy Hunt

What the Europeans do not share, however, is Washington's more aggressive approach to Iran.

"We are very worried about the risk of a conflict happening by accident, with an escalation that is unintended really on either side but ends with some kind of conflict," British Foreign Secretary Jeremy Hunt told reporters in Brussels.

"What we need is a period of calm to make sure that everyone understands what the other side is thinking," Hunt said.

Last week, US officials said they had detected signs of Iranian preparations for potential attacks on US forces and interests in the Mideast, but Washington has not spelled out that threat.

The US has about 5,000 troops in Iraq and about 2,000 in Syria as part of the coalition campaign to defeat the Islamic State group there.

It also has long had a variety of air and naval forces stationed in Bahrain, Qatar and
elsewhere in the Gulf, partly to support military operations against IS and partly as a counter to Iranian influence.

General Ghika's comments came amid dramatically heightened tensions in the Middle East.

The US in recent days has ordered the USS Abraham Lincoln aircraft carrier strike group to the Gulf region, plus four B-52 bombers.

It also is moving a Patriot air-defense missile battery to an undisclosed country in the area.

A missile is handled aboard the Nimitz-class aircraft carrier USS Abraham Lincoln in the Persian Gulf. Photo / AP
A missile is handled aboard the Nimitz-class aircraft carrier USS Abraham Lincoln in the Persian Gulf. Photo / AP

The Lincoln and its strike group had passed through the Bab-el-Mandeb Strait in the Red Sea, but officials would not disclose their exact location.

Tensions rose another notch with reports on Monday that four commercial vessels anchored off the United Arab Emirates had been damaged by sabotage.

A US military team was sent to the UAE to investigate, and one US official said the initial assessment was that each ship has a 5- to 10-foot hole in it, near or just below the water line.

The official, who was not authorised to publicly discuss details of the investigation, said the early interpretation was that the holes were caused by explosive charges.

The official acknowledged seeing some photographs of the damage to the ships, but those images have not been made public.

The official also said that the team was continuing to conduct forensic testing on the ship damage and that US leaders were still awaiting the final report.

The team's initial assessment was that the damage was done by Iranian or Iranian-backed proxies, but they are still going through the evidence and have not yet reached a final conclusion, the official said.

- AP