US and Nato start to formally withdraw troops from Afghanistan

The US has started formally withdrawing troops from Afghanistan, beginning the end of what President Joe Biden called "the forever war".

The US and Nato have had a presence in Afghanistan for almost 20 years.

But the withdrawal, which runs until 11 September, comes amid escalating violence, with Afghan security forces on high alert for reprisal attacks.

The Taliban have warned they are no longer bound by an agreement not to target international troops.

Under a deal signed last year between the militants and then-President Donald Trump, foreign forces were to have left by 1 May while the Taliban held off attacking international troops. 

Officials told Reuters during this time the Taliban has been protecting western military bases from rival Islamist groups. That has not stopped Taliban attacks on Afghan forces and civilians.