Panjshir Valley, north of Kabul, had been holding out since control of the country was seized last month – but the Taliban is now claiming it has defeated resistance fighters.
The group has been trying to project a more tolerant and moderate image since gaining power, despite the reports of violence.
Witnesses claim fighters are going door-to-door hunting former members of Afghan security forces and allies of the West.
Last week one of Afghanistan’s top female police officers went on the run in Kabul after failing to get on an evacuation flight out of the country.
Gulafroz Ebtekar, believed to be 34, was deputy head of criminal investigations in the country’s Interior Ministry.
She had notable media presence and was seen as a high-profile role model under the toppled Western-backed government.
But now she is fighting for her life after being brutally beaten at the gates of Hamid Karzai international airport, where she spent days desperately trying to flee.
She told Russian newspaper Moskovsky Komsomolet: ‘I spent five nights at the gates of Kabul airport without water or bread, in a rain of bullets and surrounded by the Taliban.
‘I witnessed the death of children and women. I sent messages to the embassies of many countries to save myself and my family, but all to no avail.’
And over the weekend fighters cracked down on women’s rights activists still protesting in Kabul.
Demonstrators marched through the Afghan capital for the second day but were stopped by special forces.
The soldiers reportedly fired into the air and used tear gas to disperse the peaceful protest, despite their promise of a less repressive regime than their previous brutal rule.
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