NATO forces have shot and killed an Afghan policeman after he opened fire on troops during a training exercise.
The shooting at the Spanish-led compound left three Spanish nationals dead.
The killing of the policeman sparked massive protests. Chanting demonstrators set fire to the base and hurled stones as the authorities fought to bring the mob under control.
NATO troops are in a race against time to train up the Afghan army and police before they take over the country’s security apparatus.
The push to hand security back to Kabul is causing tension on the ground and there have been several incidents of “rogue soldiers” turning their weapons on their instructors.
A number of demonstrators have been treated in Badghis hospital for gunshot wounds, but the circumstances surrounding their injuries are unclear.
Witnesses claim soldiers shot into the crowd.
The Taliban said that the trainee police officer was a member of their organisation and that he killed four foreigners and nine Afghan policemen.