Britain will welcome Afghan refugees fleeing the Taliban under a scheme similar to that which brought in more than 20,000 Syrians.
Foreign Secretary Dominic Raab said the UK was a "big-hearted nation" that would live up to its United Nations commitments on asylum seekers.
But he refused to put a number on how many Afghans would be granted entry, despite the US planning to relocate 30,000 and Canada accepting 20,000.
The Home Office is said to be drawing up plans for a safe, legal and direct route to the UK for Afghans, separate from the existing system.
The Syrian scheme, drawn up by David Cameron in 2015, has resettled 20,319 refugees straight from camps on the country's borders.
No 10 has confirmed that some Afghan refugees who do not have a passport will be allowed entry as officials scramble to fly possible Taliban targets out of the country.
Afghans who helped British forces but haven’t been able to obtain their paperwork will be allowed into the UK. But the exemption will only apply to those who have already been flagged and are known to the UK, such as on the ARAP relocation scheme.
The Government has refused to set a target for the number of Afghan refugees the UK will accept.
Mr Raab said: "We're working very carefully. We are obviously a big-hearted nation, we've got the criteria for asylum, that's set in law, we work with the UN on that.
"We're working very carefully on what kind of further commitment we might make."
Asked whether he could give a ballpark figure, he replied: "Not at this point."
Despite UK officials hoping to evacuate more than 1,000 people per day, numbers are still falling far short of that.
Foreign Secretary Dominic Raab said 150 British nationals came out on Sunday, and over the last week 289 Afghan nationals who served the UK were evacuated by British forces.
He told Sky News a further 350 British and Afghan nationals are set to be evacuated “over the next 24 hours”.
Opposition MPs have raised fears over new UK asylum laws which criminalise anybody who seeks to help refugees.
Meanwhile, the Government performed a U-turn after telling 35 Afghan students their places to study in the UK had been deferred for a year to September 2022.
No10 confirmed the UK “wants to” get the Chevening scholars into the UK and is still looking at practical details after it was warned they could be targets for the Taliban.
