Members of the US-backed alliance have agreed this month to wrap up their 9,600-strong mission in Afghanistan after President Joe Biden made the call to end Washington's longest war.
New advisory directs American citizens not to travel to Afghanistan and asks those already in the war-torn country to "leave as soon as possible on available commercial flights."
Mullah Abdul Ghani Baradar's lead role in peace talks with US envoy Zalmay Khalilzad is considered significant because of his stature within the Taliban, which controls or holds sway over nearly half of Afghanistan.
Almost 3,000 people were killed at New York's World Trade Centre, the deadliest attack on American soil.
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