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.


On Friday, Afghanistan, the US, China, Russia and Pakistan called for peace during the withdrawal, which is set to continue until 11 September.


Security forces in Afghanistan are on high alert for any attempted attacks on retreating US and Nato troops.