Analysis: As the US freezes Afghan reserves and Germany halts aid, the new rulers may find they are far short of what is required to govern

Afghanistan’s new Taliban rulers are likely to face a rapidly developing financial crisis, with foreign currency reserves largely unreachable and western aid donors – who fund the country’s institutions by about 75% – already cutting off or threatening to cut payments.

While the hardline Islamist group has moved in recent years to become more independent of outside financial supporters including Iran, Pakistan and wealthy donors in the Gulf, its financial flows – amounting to $1.6bn (£1.2bn) last year – are far short of what it will require to govern.

After their lightning conquest, there is little to indicate the group will moderate their strict Islamic beliefs

• Afghanistan live news: desperation as Afghans try to flee

The Taliban were born out of the mujahideen fighters who opposed the Russians during the Soviet invasion of Afghanistan, which began in 1979. Founded by Mullah Mohammad Omar, a local imam in Kandahar, in 1994, they were initially formed of a small group of madrassa students who were angry at the depredations of the warlords in the civil war that followed the Soviet withdrawal in 1989. Their influence rapidly spread over the following two years.

Crowds have packed the tarmac at Kabul airport in a bid to flee the Afghan capital as Taliban insurgents began taking over the city. Insurgents took control of the presidential palace. Al Jazeera showed footage of what it said were Taliban commanders in the palace with dozens of armed fighters. President Ashraf Ghani left Afghanistan. Many Afghans attempted the flee via road or via the airport.