The Taliban, now in power in Kabul, is putting pressure on the defeated US and refusing to extend the Aug 31 deadline for the pullout of US troops from the country.
The Taliban says it will not extend the August 31 deadline for evacuations also.
The UK was preparing to ask the US to delay the US troop withdrawal to allow more time for evacuations from Kabul airport.
Thousands are desperately waiting to get on flights out of Afghanistan, say news reports.
