SAS killings: How a scandal was uncovered

Panorama has revealed disturbing evidence of war crimes by the SAS in Afghanistan - and of subsequent attempts to cover them up. Hannah O'Grady describes how a series of alleged murders of civilians was finally brought to light.

Getting to the bottom of this story involved four years of painstaking detective work.

Crucial to this was a cache of internal emails from within the headquarters of UK Special Forces (UKSF) - the military directorate that oversees the SAS. These contained a handful of details about previously classified deadly raids that senior UKSF officers had considered suspicious back in 2011. At the time, British troops were still fighting the Taliban alongside allies in Afghanistan. read more