Taliban insurgents tightened their grip on captured Afghan territory today as civilians hid in their homes, and a European Union official said the militants now control 65% of the country after a string of gains as foreign forces pull out.

Pul-e-Khumri, capital of the northern province of Baghlan, fell to the Taliban this evening, according to residents who reported Afghan security forces retreating towards the Kelagi desert, home to a large Afghan army base.

Pul-e-Khumri became the seventh regional capital to come under the control of the Taliban in about a week, though the White House said today the United States did not see a Taliban takeover of the entire country as inevitable.

Insurgents have seized seven cities in less than a week, pic: Getty

President Ashraf Ghani called on regional strongmen to support his government, while a UN official said advances made in human rights in the 20 years since the hardline Islamists were ousted from power were in danger of being erased.

In the national capital Kabul, Ghani's aides said he was seeking help from regional militias he has squabbled with for years to defend his government. He had also appealed to civilians to defend Afghanistan's "democratic fabric".

In the town of Aibak, capital of Samangan province on the main road between the northern town of Mazar-i-Sharif and Kabul, Taliban fighters were consolidating their control, moving into government buildings, residents said.

Most government security forces appeared to have withdrawn.

"The only way is self-imposed house arrest or to find a way to leave for Kabul," said Sher Mohamed Abbas, a provincial tax officer, when asked about living conditions in Aibak

US special envoy Zalmay Khalilzad is at the talks

"But then even Kabul is not a safe option anymore," said Mr Abbas, the sole bread winner for a family of nine.

Mr Abbas said the Taliban had arrived at his office and told workers to go home. He and other residents said they had neither seen nor heard fighting today.

For years, the north was the most peaceful part of the country with an only minimal Taliban presence. The militants' strategy appears to be to take the north, as well as the main border crossings in the north, west and south, and then close in on Kabul.

The Taliban, battling to defeat the US-backed government and reimpose strict Islamic law with peace talks at an impasse, swept into Aibak yesterday meeting little resistance.

Taliban forces now control 65% of Afghan territory, are threatening to take 11 provincial capitals and are trying to deprive Kabul of its traditional support from national forces in the north, a senior EU official said today.

The government has withdrawn forces from hard-to-defend rural districts to focus on holding major population centres, while officials have appealed for pressure on neighbouring Pakistan to stop Taliban reinforcements and supplies flowing over the porous border. Pakistan denies backing the Taliban.

Head of Afghanistan's high Council for National Reconciliation Abdullah Abdullah (centre) enters talks in Qatar's capital Doha during an international meeting on the escalating conflict in Afghanistan, pic: Getty

In Washington, White House press secretary Jen Psaki said the Biden administration still felt that only negotiations could bring lasting peace and stability to Afghanistan.

"Ultimately, our view is that the Afghan national security defence forces have the equipment, numbers and training to fightback, which will strengthen their position at the negotiating table," Psaki told a regular press briefing.

"The president continues to believe that it is not inevitable that the Taliban takes over Kabul or the country."

The United States has been carrying out a small number of air strikes in support of government troops but said it was up to Afghan forces to defend their country.

Today, US Defense Department spokesman John Kirby said the strikes were having a "kinetic" impact on the Taliban but acknowledged their limitations.

"Nobody has suggested here (at the Pentagon) that airstrikes are a panacea, that will solve all the problems of the conditions on the ground. We've never said that," Kirby said.

US President Joe Biden insists that the US will withdraw its troops from Afghanistan on 31 August

However, Washington's special envoy Zalmay Khalilzad is now in Qatar to try and convince the Taliban to accept a ceasefire.

Envoys from hosts Qatar, Britain, China, Pakistan, Uzbekistan, the United Nations, and European Union were also due to discuss the situation in Afghanistan, a source told AFP.

In talks over three days, representatives from governments and multilateral organisations will press for "a reduction of violence and ceasefire and a commitment not to recognise a government imposed by force," the State Department said.

'Deeply disturbing reports'

Taliban and government officials have confirmed that the Islamist insurgents have overrun six provincial capitals in recent days in the north, west and south.

Security forces in Pul-e-Khumri, southeast of Aibak, were surrounded as the Taliban closed in on the town at a main junction on the road to Kabul, a security official said.

Gulam Bahauddin Jailani, head of the national disaster authority, told Reuters fighting was going on in 25 of 34provinces and 60,000 families had been displaced over the past two months, with most seeking refuge in Kabul.

About 400,000 Afghans have been displaced in recent months and there has been an increase in numbers of people fleeing to Iran over the past 10 days, the EU official said.

There was intense fighting in Lashkar Gah over the wekeend, pic: Getty

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Six EU member states warned the bloc's executive against halting deportations of rejected Afghan asylum seekers arriving in Europe despite major Taliban advances, fearing a possible replay of a 2015-16 crisis over the chaotic arrival of more than one million migrants, mainly from the Middle East.

A resident of Farah, the capital and largest city of Farah province in western Afghanistan near the border with Iran, said the Taliban had taken the governor's compound and there was heavy fighting between Taliban and government forces.

Civilians said the Taliban had captured all key government buildings in the city.

UN human rights chief Michelle Bachelet said reports of violations that could amount to war crimes and crimes against humanity were emerging, including "deeply disturbing reports" of the summary execution of surrendering government troops.

"People rightly fear that a seizure of power by the Taliban will erase the human rights gains of the past two decades."

Afghan special forces patrol the streets of Herat as the Taliban continue a series of offensives

Major northern city in jeopardy

The Taliban, ousted in the weeks after the 11 September 2001 attacks on the United States, appeared to be in a position to advance from different directions on Mazar-i-Sharif. Its fall would deal a devastating blow to Ghani's government.

Atta Mohammad Noor, a northern militia commander, vowed to fight to the end, saying there would be "resistance until the last drop of my blood". He added on Twitter: "I prefer dying indignity than dying in despair."

India sent a flight to northern Afghanistan to take its citizens home, officials said, asking Indians to leave.

The United States and Britain have already advised their citizens to leave Afghanistan.

The United States will complete the withdrawal of its forces at the end of this month under a deal with the Taliban, which included the withdrawal of foreign forces in exchange for Taliban promises to prevent Afghanistan being used for international terrorism.

The Taliban promised not to attack foreign forces as they withdraw but did not agree to a ceasefire with the government.

An Afghan National Army commando stands guard along the road in Enjil district of Herat province, pic: Getty