An intelligence briefing for the UN says the Taliban are stepping up the search for "collaborators"
More anti-Taliban protests have taken place in several cities
At least 12 people have been killed at Kabul airport since Sunday, a Taliban official says
Western countries continue evacuating nationals and Afghans who worked for them
Asked in an ABC TV interview if he made any mistakes with the Afghan exit, US President Biden says: "No"
The IMF says that Afghanistan will no longer have access to its funds
The Taliban say they have entered a number of district centres in Kabul, and that it controls 11 of them.
A spokesman said they entered the districts to "ensure safety".
This follows earlier claims from the Taliban that they had taken over the presidential palace in the city.
All commercial flights out of Kabul's International Airport have been suspended, according to a Nato official.
Only military aircraft are allowed to operate.
It comes as British Airways confirmed it was currently not flying through Afghanistan's airspace.
PM: No one wants Afghanistan to, once again, be a breeding ground for terror
UK Prime Minister Boris Johnson has just spoken about the unfolding situation in Afghanistan.
It was clear there was going to be a new government, Johnson said, adding it was important that the West collectively worked together to make clear that no one wanted Afghanistan to be a breeding ground for terror.
Speaking from Downing Street, he told reporters the situation continues "to be difficult and is getting more difficult".
He said the UK's priority was to deliver on its obligations to UK nationals and to those who have helped with British efforts in the country. He added that the government had the means to get its citizens out over the next few days.
"The ambassador has been there at the airport to process the applications," Johnson said.
Johnson also noted he did not want others around the world to prematurely recognise the Taliban as the new government.
A vital Afghanistan-Pakistan border crossing has seen clashes between Afghan travellers and Pakistani security in recent days.
The Chaman-Spin Boldak checkpoint was captured and closed by the Taliban last month, but reopened on Saturday after negotiations between the Taliban and Pakistani officials allowed hundreds of stranded travellers to return home.
The border post is Afghanistan's second busiest, usually seeing some 900 vehicles crossing there. It is a key commercial crossing as it grants landlocked Afghanistan passage to the Pakistani coast.
Image source, Reuters
Image source, EPA
Image source, EPA
Image source, ReutersLorries wait to cross the border
Image source, EPA
Image source, ReutersAfghans crossing into Pakistan
Ashitha Nagesh
BBC News
Image source, Sabrina SaqebSabrina Saqeb was elected an MP in the Afghan parliament in 2005, sitting in what was the country's first parliament in 30 years. At 25, she was the youngest MP elected.
She went on to establish an organisation for women in the country.
For the past few years, Saqeb and her family have lived in Canada.
Saqeb tells the BBC that watching the Taliban advance on her home country from afar has left her feeling "homeless".
"No matter how long we have lived outside Afghanistan we are all deeply connected. Our families are there, our friends are there, our hopes are there," she says.
"You call somewhere home, you try to build a house for yourself, and then it collapses. I feel that whatever we had is lost - it's now gone. All these past 20 years of our lives have gone in a few weeks.
"Maybe the current government of Afghanistan is weak, is corrupt. But at least they came into power through a system, and we had a voice in that system."
The Taliban, she says, have come in by force.
As we reported earlier, the US embassy in Kabul has issued a security alert saying there may be gunfire at the airport.
Separately, people have been seen running to planes on the tarmac, according to eyewitness accounts. There are very few people are left to staff the airline and immigration desks, they say.
Nato Secretary General Jens Stoltenberg has also said the alliance was helping to keep the airport open to facilitate the evacuations there.
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David Martinon, France's Ambassador to Afghanistan has posted footage of him leaving Kabul's former Green Zone.
The Green Zone is where government buildings, residencies and foreign embassies are housed.
Earlier on Sunday, France's Minister of Foreign Affairs, Jean-Yves Le Drian, announced France was moving its embassy to be closer to Kabul's airport.
He said the embassy will remain operational for the evacuation of all French citizens who might be left in the country.
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The Taliban are claiming to have taken over the presidential palace in Kabul.
President Ghani left the country earlier on Sunday - but the exact situation at the palace is still unclear.
According to local journalist Bilal Sarwary who spoke to two Afghans involved in direct negotiations, external, part of the agreement was that Ghani would join the transition of power ceremony inside the palace - but instead he and his senior aides left the country.
"Palace employees were then reportedly told to leave and the palace was [left] empty," the aides said. The Taliban later told the Reuters news agency that they had taken it over.
There has been no confirmation from government officials.
An NGO which runs a hospital in Kabul claims more than 40 people have arrived at their hospital - most coming from the Qarabagh area, where there has been fighting.
The tweet, external, which cannot be independently verified by the BBC, says 22 people have been treated in hospital and those with more minor injuries have been referred to other facilities.
More casualties were arriving, it added.
There are reports of gunfire at Kabul's airport, according to a security alert just issued by the US Embassy.
Officials have instructed US citizens in the area to take shelter, as "the security situation in Kabul is changing quickly".
Any Americans who still require assistance to leave Kabul have been told to register online, after operations at the embassy concluded.
Image source, EPAUnicef says it hopes to resume operations within a couple of days
A spokeswoman for the United Nations Children's Fund (Unicef) in Kabul has told the BBC that, so far, the Taliban have respected "the sanctity of the charity's offices".
She said the Taliban wanted the UN to stay and continue their work.
Sam Mort said militants had been polite and were currently safeguarding UN operations.
She stressed Unicef's commitment to the women and children of Afghanistan, saying it hoped to resume operations within a couple of days.
Image source, ReutersThe head of Afghanistan's peace council has criticised President Ashraf Ghani for leaving the country
Abdullah Abdullah, chairman of Afghanistan's High Council for National Reconciliation, has confirmed that President Ashraf Ghani has left the country.
The High Council for National Reconciliation was established to negotiate with elements of the Taliban.
Describing him as "a former president", Abdullah said Ghani had "left the nation in such a situation".
"God will hold him accountable and the nation will also judge," he said, in a video on Facebook.
The BBC's Yalda Hakim was contacted on air by Taliban negotiator Suhail Shaheen to tell the people of Kabul "their lives are safe".
"We assure the people in Afghanistan, particularly in the city of Kabul, that their properties, their lives are safe - there will be no revenge on anyone," he told her.
"We are the servants of the people and of this country."
Taliban spokesman tells BBC they are 'awaiting a peaceful transfer of power'
The top US diplomat in Afghanistan, Chargé d’Affaires Ross Wilson, has fled the embassy.
He has been relocated to Kabul airport, according to a US official.
The US flag which flew over the embassy has also been taken to the airport and will be removed from the country.
US Secretary of State Anthony Blinken says the US is moving its embassy compound to Kabul airport.
He told ABC News: "It's why we had forces on hand - to make sure we could do this in a safe and orderly fashion. The compound itself, folks are leaving there and going to the airport."
He added that the embassy has lists of people to get out of harm's way and is doubling down on efforts to do so.
He also denied any comparisons of the current situation to the 1975 fall of Saigon, in Vietnam, and insisted that the Afghan mission had been "successful"
"This is not Saigon," he said.
It comes as top US republican Steve Scalise called the US withdrawal an "epic failure".
He told CBS News on Sunday that the evacuation of the US embassy in Kabul was "President Biden's Saigon moment".
He blamed the collapse of Afghanistan on Biden and and his intelligence team, accusing their predictions of being "devastatingly wrong".
Saeedi* is a 22-year-old student from Kabul. He walked for more than five hours to get to the airport today.
"My feet hurt, they have blisters and I'm finding it difficult to stand," he tells the BBC.
"It was like a military town - people were in traditional clothes, but they had weapons and were firing in the air. It reminded me of the Jihad that I heard of from my parents."
Saeedi is about to start a Master's degree in Istanbul. He came back to Kabul to spend some time with his family before his course began.
"Now that I'm leaving, I think about my family - they don't have any way to escape. I don't see a future."
*Names have been changed
UK Foreign Secretary, Dominic Raab has expressed his "deep concerns" about Afghanistan's future with Pakistan's Foreign Minister Shah Mahmood Qureshi.
Writing on Twitter, he said it was "critical" the international community was united in telling Taliban forces that violence must end and human rights be protected.
His comments come after Conservative MP Tom Tugendhat criticised Raab for not making any statement earlier, as the Taliban advanced across the country and major cities fell to their forces.
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Nato is maintaining its diplomatic presence in Kabul and helping to keep the city's airport running, a Nato official has told Reuters.
"Nato is constantly assessing developments in Afghanistan," the official said, adding the security of the alliance's personnel was paramount and that Nato would continue to adjust as necessary.
On 8 July, President Joe Biden poured cold water on the theory that the Taliban could swiftly conquer Afghanistan.
"The jury is still out," he said, speaking at the White House last month.
"But the likelihood there's going to be the Taliban overrunning everything and owning the whole country is highly unlikely."
Yet, just weeks after this pronouncement, little of the country remains in government control.
Shooting is being reported in several parts of Kabul, Reuters reports, citing witnesses and the interior ministry.