Eight foreign medical workers have been killed by gunmen in Afghanistan's remote northeast.
The Taliban has claimed responsibility for the killings and accused the medical workers of promoting Christianity.
Zabihullah Mujahid, a spokesman for the Taliban, told Reuters that bibles translated into Dari had been found.
Afghan police said the eight foreigners had been shot dead along with three Afghans.
The executive director for the Christian charity International Assistance Mission confirmed that the dead were British, German and US citizens.
Dirk Frans said: 'Five men, all American, and three women, an American, a German and a Brit, were killed.'
The dead British woman has been named as Dr Karen Woo, from Stevenage, Hertfordshire.
IAM provides the majority of eye care available to Afghans. It runs eye hospitals in Kabul, Herat, Mazar and Kandahar.
The charity said: 'This tragedy negatively impacts our ability to continue serving the Afghan people as IAM has been doing since 1966.
'We hope it will not stop our work that benefits over a quarter of a million Afghans each year.'
Aqa Noor Kentuz, the police chief for Badakshan province, said the 'bullet-riddled' bodies were found early this morning. It is believed they had been shot several days ago.
He said they had been camping near jungle on a tour of Badakshan and Nuristan when they were attacked.
'Before their travel we warned them not to tour near jungles in Nuristan, but they said they were doctors and no one was going to hurt them,' Mr Kentuz said.
Jamaluddin Badr, governor of nearby Nuristan province, also said the doctors had visited several districts in Nuristan and Badakshan, helping local Afghans.
