Boris Johnson exclaimed 'F***' upon first learning of Donald Trump's drone strike on the top Iranian general Qassem Soleimani, reports say.

The Prime Minister is on holiday in Mustique with girlfriend Carrie Symonds and was informed of the killing over the phone on Friday.

Britain, unlike Israel, was not given prior warning of the attack which has already threatened to destabilise the Middle East and provoke a retaliation to the West.

Boris Johnson reportedly exclaimed 'F***' upon first learning of Donald Trump's drone strike on the top Iranian general Qassem Soleimani

Britain was not given prior warning of the attack which resulted in the death of Qassem Soleimani

Mr Johnson had the four-letter outburst after British troops first learned of the airstrike from their US counterparts stationed together in Baghdad, The Mirror reported.

He has been criticised for not cutting short his Caribbean break or speaking out about the seismic event but he is now due to fly home on Sunday.

Furious British security officials have now accused No 10 of allowing a 'political vacuum' to open up while Mr Johnson was on holiday, during which he failed to make any comment on the incident.

Downing Street insisted that Mr Johnson would be briefed in full on the situation once he returns to work, including on the possibility of retaliatory actions Iran might take against the UK.

He will likely be greeted by Sir Mark Sedwill, the National Security Adviser, who has been locked in meetings today with the heads of the UK intelligence agencies on potential risks to ships and citizens in the Middle East.

Boris Johnson and his girlfriend Carrie Symonds have been unwinding at one of the world’s most luxurious hideaways

With its three staff, the villa boasts four-poster beds, open-air terraces and living quarters set around a pool

Number 10 declined to comment on Mr Johnson's reaction to the news of the killing.

Jeremy Corbyn, known for his pacifism, says he would have immediately left his holiday to help defuse a situation which 'could have grave consequences for the UK and the world.'

Similarly, Labour's Angela Rayner said Mr Johnson must return and leaving diplomacy in the hands of Foreign Secretary Dominic Raab was unwise.

The Prime Minister and Carrie Symonds have been staying in a £20,000-per-week villa on the luxury private island of Mustique.

But a break from geopolitical conflict he did not receive and he is now being whisked back to the UK.

When he was Mayor of London, Mr Johnson refused to cut short a family holiday to Canada in 2011 when the riots broke out, and faced angry heckles when he returned.