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Boris Johnson reportedly uttered an abrupt, four-letter response when he was told of Donald Trump ’s drone strike on a top Iranian general: “F***.”

The Prime Minister, who has been enjoying a sun-drenched luxury island holiday since Boxing Day, was informed of the killing of General Qassem Soleimani over the phone on Friday.

Britain was given no advance notice of the attack - and reportedly only became aware it was underway because British troops are stationed alongside US forces in Baghdad.

And Mr Johnson is under fire for failing to return from his Caribbean getaway to deal with the fallout from the US strike - or speak publicly about the crisis since it began to unfold on Friday.

Number 10 declined to comment on Mr Johnson's reaction to the news of Friday's air strike.

Mr Johnson is expected to return to London in time for ministerial meetings in Number 10 on Monday.

The Sunday Mirror understands no ministerial COBRA meetings have taken place in the Prime Minister’s absence to discuss the crisis.

But Jeremy Corbyn said he should have immediately cut his holiday short to deal with “an issue that could have grave consequences for the UK and the world.”

(Image: MustiqueIsland.com)

Foreign Secretary Dominic Raab issued a statement warning Britons against travelling to Iraq at a time of “heightened tensions”, Mr Johnson has yet to speak publicly on the general’s killing.

Labour ’s Angela Rayner said: “The PM must at least get off his Sun lounger to make some kind of statement on the US attack killing the senior Iranian general and the escalating dangerous situation between Iran and the USA.

“Leaving it to the hapless Dominic Raab will not suffice”

And Mr Corbyn said: "The assassination of Qassem Suleimani risks an extremely serious escalation of a dangerous conflict with global consequences by a belligerent US President.

“I have written to the Prime Minister and raised important questions about what he knew in advance of the strike, the steps the UK government is taking to ensure the safety of UK nationals and other people in the region, and what efforts it is making with the UN to promote peace and security.

“ Boris Johnson should have immediately cut short his holiday to deal with an issue that could have grave consequences for the UK and the world.”

(Image: AFP via Getty Images)

The Prime Minister and girlfriend Carrie Symonds have been staying in a £20,000 a week villa on the exclusive private Island of Mustique.

There are no direct flights from Mustique to London. Holidaymakers leaving the island must charter a “hopper” flight to nearby St Lucia or Barbados to take a connecting flight to London.

But the Island’s tiny airport does not have lights on the runway, meaning aircraft can only arrive and leave during the day.

Mr Johnson infamously refused to cut short a family holiday to Canada in 2011 while he was Mayor of London to deal with the outbreak of riots in the capital.

It was three days before he agreed to return from his summer getaway - and he faced angry heckles when he arrived in Clapham, broom in hand, to assist with the clean up.

Mr Raab will visit the US next week to meet with Secretary of State Mike Pompeo in a previously planned visit. He’s also expected to meet with his counterparts in France and Germany in the next few days, and will be visiting Canada.

Acting Lib Dem leader Sir Ed Davey said: “Boris Johnson's global Britain has got off to a disastrous start - with Donald Trump keeping him in the dark about his reckless action which has heightened tensions in Iran.

"No-one can deny Iran is ruled by a brutal regime, but this Conservative government have allied themselves closely to someone determined to stoke dangerous tensions abroad for political gain back home - and an ally who doesn't even bother to share his plans.

"This is nothing short of highly embarrassing for Boris Johnson and the supposed special relationship.

"The UK government must now work with our moderate, liberal allies across the globe to deescalate the situation and try to reduce the tensions.

"The Conservative Government must make clear their position and accept pandering to Donald Trump is not in the UK’s interests. "