Reports of the Taliban carrying out summary executions in Afghanistan are "credible", says UN Human Rights High Commissioner Michelle Bachelet.
The Taliban practised a strict version of Islamic law (Sharia) when they ran Afghanistan before 2001.
They retook the country nine days ago with the fall of the capital, Kabul.
Since then, the militants have tried to convey a more restrained image, promising rights for women and girls and some freedom of speech.
China's UN envoy said the US military and other international forces should be held accountable for rights violations committed during their time in Afghanistan.
Thousands of Afghans are still missing at Kabul airport, hoping to flee the country before August 31. That is the deadline set by US President Joe Biden for American troops to leave Afghanistan.