The insurgent Taliban have captured almost all of Afghanistan, leaving the government in control of little more than the capital Kabul and its immediate surroundings.
Here are some facts about the city and previous assaults:
CURRENT SITUATION
The city's population of 5 million people has been swollen with thousands fleeing other parts of the country. Thousands of troops from the United States and Britain are flying in to secure the airport and their embassies as foreign missions start evacuating personnel.
The Afghan army has vowed to defend the capital.
Kabul covers an area of about 1,000 square km (400 sq miles) and is ringed by mountains. There are four main roads into the city: from Maidan Shahr in the southwest, Pul-e-Alam in the south, Surobi in the east and Bagram in the north.
The Taliban took Pul-e-Alam on Saturday without much resistance, a local provincial council member said.
The Taliban say they are close to capturing Maidan Shahr.
They have already taken Ghazni, down the road from Maidan Shahr, and have a strong presence in surrounding areas.
On Sunday, the Taliban took the eastern city of Jalalabad without a fight. The main highway from there to Kabul passes through Surobi.
PAST ASSAULTS ON KABUL
In 1996, the Taliban conquered Kabul from the Mujahedin alliance with an assault through Surobi. After winning a battle at Surobi, the Taliban marched unchecked into Kabul.
In 2001, US-backed forces re-took Kabul with an attack from the north, entering the city via Bagram after a barrage of air strikes killed hundreds of entrenched Taliban fighters who had formed a defensive ring.
Bagram airbase, 64 km (40 miles) north of Kabul, is the country's most significant military asset and was the seat of the US military during the 20-year-long Afghan war before they vacated it just a month ago. The base is now in the hands of the Afghan military.
POWER AND TALKS
The Taliban have no air power and have used artillery and rockets followed by ground assaults while capturing several cities and provincial capitals in recent weeks. Some areas have fallen without a fight as provincial leaders sought to avoid bloodshed and surrendered.
A bloody battle for Kabul could be avoided if a political solution is struck between the government and the Taliban.
Factbox: What to watch for as the Taliban inch closer to Kabul
The insurgents have insisted they will not negotiate with a government headed by President Ashraf Ghani.
Ghani has shown no inclination to move. On Saturday, he said he was in urgent talks with local leaders and international partners and that "re-integration of the security and defence forces is our priority".
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