Fears Iran ‘could hit London or Paris’ with missile strikes after Tehran’s chilling message

The Foreign Secretary spoke out after it was revealed Iran had launched two ballistic missiles at the Diego Garcia military base in the Chagos Islands

18:11, 21 Mar 2026Updated 21:24, 21 Mar 2026

Foreign Secretary Yvette Cooper says the UK will not be involved in offensive action and has “taken a different view from the US and Israel” despite Iran firing missiles towards a joint UK-US base(Image: Thomas Krych/ZUMA Press Wire/Shutterstock)

Iran launched two ballistic missiles at the joint UK-US Diego Garcia military base before Keir Starmer authorised an expansion of America’s use of British sites, it was revealed today.

Neither warhead hit the facility on the Chagos Islands, in the Indian Ocean, after one reportedly failed in flight and the other was intercepted by the United States. But it marked a worrying development for British military chiefs, amid fears the extremist regime may have more military might than previously believed, with major European capitals, including Paris, potentially within its reach.

Asked this afternoon if she is concerned Iran may have more powerful weapons than previously thought, Foreign Secretary Yvette Cooper said: “This is the latest in Iran’s reckless strikes aiming at Gulf partners, at international shipping, at allies and at British interests as well. That is why we have continued to support defensive action to support UK interests including offensive action against ballistic missile threats. We want to see as swift as possible resolution to this conflict, that supports regional security and stability, because that is what we need for UK security and for our economy as well.”

The IDF claims Iran has missiles that can reach London, Paris or Berlin(Image: FDD)

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Israeli defence minister Israel Katz said that strikes will “intensify” in the next week, with a “significant” rise in attacks. The IDF said the Diego Garcia attack was the first time Iran had launched a long-range missile, capable of reaching a distance of around 4,000km, since the start of the war.

In a statement, a spokesperson claimed: “The Iranian terrorist regime poses a global threat. Now, with missiles that can reach London, Paris or Berlin.”

Analysis from the FDD last month suggested Iran has ballistic missiles capable of hitting major European cities(Image: FDD)

It had been thought Iran’s missiles have a range of 2,000km – 1,243 miles. But the Diego Garcia base is about 3,800km – 2,361 miles – from Tehran. In contrast, London is around 4,435km – 2,750 miles – away. General Sir Richard Barrons, former head of the Joint Forces Command, claimed Iran’s extreme regime has been “serially underestimated”. And a foreign affairs analyst claimed a long-held assumption about Iran’s missile capability “has just collapsed”.

General Barrons said: “War generally does not follow a script and the enemy always gets a vote and, in this case, the enemy’s vote, Iran, has been serially underestimated. We are where we are. This conflict and the way it has turned out now puts British interests and those of our allies at risk and ignoring it completely is no longer appropriate even if the decisions at the start of the conflict were very different.

A photo, released by the US Navy, shows an aerial view of the Diego Garcia military base in the Chagos Islands (Image: AP)

“Iran and the UK have been at odds for a very long time. The Iranian regime regards the UK as an enemy and so if you are seen to participate in some fashion with this US-Israeli offensive action then they are clearly going to respond and we should not be surprised.”

Foreign affairs analyst Nawaf Al-Thani added: “Iran may have demonstrated reach far beyond what much of the world believed it possessed. Paris comes into range. London moves much closer to the edge of vulnerability depending on launch point and payload.

“This would mean the missile threat is no longer confined to the Gulf, Israel, or parts of South Asia. It would mean the radius of deterrence, defense, and fear has expanded dramatically. If confirmed, Diego Garcia was not just a target. It was a message.”

General Sir Richard Barrons, former head of the Joint Forces Command, has said Iran’s extreme regime has been “serially underestimated”(Image: Getty Images)

Iran may have used a space launch vehicle to aim ballistic missiles at Diego Garcia, experts have claimed. Iran’s Simorgh space launch vehicle could offer greater range at the likely cost of terminal accuracy.

Retired Royal Navy commodore Steve Prest said: “Ballistic missiles are space rockets. They launch, they go really high up and they come down really fast. If you’ve got a space program, you’ve got a ballistic missile program.”

Prest said the launches were likely a message of defiance, to say “look what we can do.”

Conservative Leader Kemi Badenoch today claimed the UK is being “dragged into” the Iran conflict “whether we like it or not”. She said: “The sad thing is, whether we like it or not, we’re being dragged into it and what we need is a prime minister who can think ahead.”

Asked if she would have backed British planes taking part if she was prime minister, Mrs Badenoch said: “I wouldn’t have joined in the initial strikes, no, but I would have expressed solidarity with the US like the Canadians and the Australians did.”

Badenoch also accused Starmer of a “cover up” over the attempted attack on the Chagos Islands. She said: “The Prime Minister needs to immediately come clean about the details of this latest attack on British troops and explain why the public weren’t informed sooner.”

She added: “Keir Starmer has dithered and delayed on the Iran conflict from the outset. Now we find out, from the media and not the Prime Minister, that the British base on Diego Garcia has been the target of Iranian missile attacks.

“As we saw with Peter Mandelson, Starmer’s first instinct is always to cover up the truth. On Wednesday he attacked me at PMQs for calling for the proper defence of our bases, now we learn that as he did so our base in the Chagos Islands was being targeted by Iran.”

Defences at UK bases in the Gulf are understood to be at their highest levels amid fears of further retaliation as the US-Iran war continues. The UN’s nuclear watchdog today urged “military restraint” to avoid any risk of a nuclear accident” after Iran said its Natanz nuclear facility was targeted by strikes on Saturday morning.

US Military personnel take away Joint Direct Attack Munitions (JDAMs), removed from a US Air Force B-1 Lancer bomber at RAF Fairford, south-west England, earlier this month(Image: AFP via Getty Images)

The Israel Defense Forces (IDF) also claimed they had carried out widescale air strikes in Tehran overnight, hitting dozens of targets, including sites used to produce critical components for ballistic missiles and rocket fuel. It came after at least 640 strikes were carried out across 17 Iranian provinces on Friday, causing at least 68 casualties, the US-based Human Rights Activists News Agency (Hrana) said.

The IDF also claimed it had identified missiles launched towards Israel on Saturday afternoon, while Iran’s Islamic Revolutionary Guard Corps alleged it had “pounded” air bases in Kuwait and the UAE, which it claimed are used by the US and Israel.

The commander of the Islamic Revolutionary Guard Corps (IRGC)’s Aerospace Force tonight claimed that the country will launch more missiles towards Israel overnight.

Seyed Majid Mousavi wrote on X: “From this moment, I declare the missile dominance of Iran’s sons [forces] over the skies of the occupied territories.

“The new tactics and launch systems” will leave the US and Israel “astonished”.

A fire burns outside the grounds of the US Embassy headquarters in Baghdad’s fortified “Green Zone” on March 17 following a drone and rocket attack (Image: AFP via Getty Images)

Iran also issued a statement claiming it had attacked Israel’s Dimona nuclear reactor on Saturday “after the US and Israel attacked the Bushehr power plant and the Natanz facilities”.

The Iranian Tasnim news agency wrote: “The enemy has once again received an unforgettable lesson. The missile attack on the Dimona area has once again sent a clear message: No area is safe from Iranian missiles. The enemy must surrender before it is too late.”

At least 47 people, including a 10-year-old boy, were treated for injuries following the missile impact, Israel’s emergency service said.

Meanwhile, the US military has claimed Iran’s ability to threaten the Strait of Hormuz has been “degraded” since the US bombed an underground facility where they claim Iran stored cruise missiles and other weapons earlier this week. On Friday, the Prime Minister gave the US the green light to use British bases to strike Iranian missile sites attacking ships in the Strait of Hormuz.

Mr Starmer has repeatedly stood by his initial decision not to grant the US request to use UK bases to launch its initial wave of missile strikes against Tehran. Permission was granted for US jets to use British airfields for defensive operations only after Iran retaliated.

The move came after US President Donald Trump criticised Mr Starmer and the leaders of other Nato countries for not helping reopen the strait. Tehran’s throttling of the key oil shipping route, in retaliation to joint US-Israeli attacks on the regime, has sparked chaos for global markets.

Speaking on Friday, Trump had said the US was considering “winding down” military action and added his military was “getting very close” to meeting its objectives in the war. Asked about the decision to allow the US to use UK bases, Mr Trump said: “Well it’s been a very late response.” He added: “I was a little surprised at the UK, to be honest with you. They should have acted a lot faster.”

Donald Trump has been critical of Prime Minister Keir Starmer’s reluctance to get involved in the US-Iran war(Image: Andrew Leyden/NurPhoto/Shutterstock)

On Saturday, Iran’s foreign minister Abbas Araghchi posting on X, writing: “Vast majority of the British People do not want any part in the Israel-US war of choice on Iran. Ignoring his own People, Mr Starmer is putting British lives in danger by allowing UK bases to be used for aggression against Iran. Iran will exercise its right to self-defence.”

Asked today if Iran’s attempted targeted attack on the Chagos Islands had any bearing on the UK’s decision to allow the US to use its bases, Ms Cooper said: “Our approach to this conflict has been the same throughout. We were not, and continue not, to be involved in offensive action and we take a different view from the US and Israel on this.

“But we are supporting defensive action to support our interests and the UK national interests. That includes recognising Iran’s escalating threat to international shipping, as well as their threat to our Gulf partners, none of whom were involved in the initial strikes as well. We want to see a swift resolution to this conflict because that is what is in everyone’s interests.”

Asked if the UK is being dragged into the war, Ms Cooper added: “As the Prime Minister has made clear, we will provide defensive support against these reckless Iranian threats. But we have not been and we continue not to be involved in offensive action and we want to see the swiftest possible resolution. As he’s made clear we will not be dragged into a wider conflict.”

A Ministry of Defence spokesperson said: “Iran’s reckless attacks, lashing out across the region and holding hostage the Strait of Hormuz, are a threat to British interests and British allies. RAF jets and other UK military assets are continuing to defend our people and personnel in the region. This government has given permission to the US to use British bases for specific and limited defensive operations.”