Taliban in power may find themselves fighting their own insurgents

Analysis: new regime may face enemy composed not of fighters loyal to former US-backed government but those who see new rulers as sellouts

Joe Biden has said the US will maintain an over the horizon" counter-terrorism capability to neutralise the threat posed by Islamist extremist groups in Afghanistan.

With no troops on the ground, no intelligence-gathering operation in the country and no ally with shared borders, this kind of long-range effort to stop plots targeting the west will not be easy - and is made significantly harder by the range of the organisations based in territory now nominally under Taliban control.