British officials fear the US could pull out of Kabul within DAYS leaving thousands stranded as Biden administration is accused of keeping allies in dark about rescue plan

British officials are reportedly concerned that the U.S. could withdraw from Kabul airport any time, leaving other countries in the lurch as the world scrambles to get out of Afghanistan.

In a sign of deep distrust between the close allies, British commanders were left wondering whether the U.S. would leave without forewarning them.

Sources told The Guardian that they could not guarantee how long the U.S. would keep its contingent of 6,000 troops on the ground and cautioned that the UK could not continue the rescue without their presence. 

The U.K. currently has 900 troops in Afghanistan, supervising the evacuation of the 4,000 or so U.K. citizens still in the country, and the thousands of Afghans who have helped the U.K. over the past 20 years.

An American soldier points his gun at an Afghan man on Monday, amid chaotic scenes at Kabul airport

The Taliban turned on the crowd at Kabul airport on Tuesday, driving the hundreds back from the airport perimeter as they pushed to flee the country

An Afghan woman is seen lying on the ground after the Taliban used whips and sharp objects to drive people from the airport

A child covered in blood is carried away with his father after the Taliban used whips on the crowd trying to get in to Kabul airport on Tuesday

A man cries as he watches fellow Afghans get wounded after Taliban fighters use gunfire, whips, sticks and sharp objects to maintain crowd control over thousands of Afghans who continue to wait outside Kabul airport for a way out

Hundreds of people are seen gathering outside the airport in Kabul on Tuesday, in the hope of fleeing the country

British nationals and Afghan evacuees disembark a flight from Afghanistan at RAF Brize Norton in England on Tuesday

Members of the British Army, from 16 Air Assault Brigade, disembark from an RAF Voyager aircraft after landing in Kabul on Tuesday. Britain now has 900 troops in Afghanistan

On Wednesday Britain's ambassador to Afghanistan, Sir Laurie Bristow, said they were working with the Taliban in Kabul on a 'tactical, practical level' to evacuate citizens and eligible Afghans.

He said that the evacuation program would last days, not weeks. 

The Pentagon on Wednesday said they too were working with the Taliban to facilitate the evacuations.

President Joe Biden added that the Taliban is 'cooperating, letting American citizens get out, American personnel get out, embassies get out' - but he said that it has been more difficult than expected to evacuate Afghans who assisted the U.S.  

He denied that the U.S. was considering an imminent end to the Afghanistan evacuations, saying that the U.S. forces could stay on beyond the August 31 deadline if needed, to get all Americans out. 

'If there's American citizens left, we're going to stay to get them all out,' Biden told ABC News in an interview that aired Wednesday evening.

'Americans should understand that we're going to try to get it done before August 31. 

'If we don't, we'll determine at the time who's left.' 

Joe Biden on Wednesday night denied that the U.S. was planning to bolt from the airport

Boris Johnson, seen heading to parliament on Wednesday, was roundly criticized for going along with Biden's chaotic withdrawal from Afghanistan

Defense Secretary Lloyd Austin said 5,000 people have been evacuated to date and the U.S. intends to increase that flow using various U.S. military aircraft.

'We're going to get everyone that we can possibly evacuate, evacuated. And I'll do that as long as we possibly can until the clock runs out or we run out of capability,' Austin said on Wednesday.

British special forces, working with the U.S., have been inside Kabul to protect citizens sheltering in place, according to The Mirror.

Yet the tension between the two countries who have committed the highest number of troops to the conflict was undeniable.

Members of the British army arrive in Kabul on Sunday. There are now 900 British troops in Afghanistan assisting with evacuations

Commanding General US Central Command Kenneth F. McKenzie tours an evacuation control center at Hamid Karzai International Airport on Tuesday

Pandemonium unfolded at Kabul airport on Monday as thousands of people ran on to the runway in a desperate attempt to escape Taliban rule, fearing bloody reprisals by the Islamists

Thousands of Afghanis had raced on to the tarmac at Kabul airport before some jumped on the side of a US C-17 jet which was flying hundreds of diplomatic staff and visa holders out of the country

Boris Johnson, the British prime minister, was excoriated in parliament on Wednesday for the chaotic scenes in Afghanistan, at the end of a conflict that cost 457 British lives. The Americans lost five times as many servicemen and women, but deployed 10 times as many troops.

Johnson's critics accused him of blindly following Biden, and not doing enough to prevent the total collapse of the country.

'He hasn't just humiliated America's Afghan allies,' said Rory Stewart, a former British cabinet minister with lengthy experience in Afghanistan. 

'He's humiliated his Western allies by demonstrating their impotence.'