Have a look at my latest investigation for Al Jazeera America, which shows that three suspected insurgents who were rounded up in a joint US-Afghan operation were handed over to a militia, who then executed them:
According to Belcher, ISAF had not heard allegations of the killings in Andar until they were raised by Al Jazeera, but it subsequently conducted an inquiry. “The inquiry found no information that substantiates the allegations. We have passed the allegations to our Afghan counterparts to conduct their own inquiry,” he said. “According to Afghan officials with whom we spoke after receiving your inquiry, these individuals were questioned and later released without harm.”
Spokespersons at the both the Afghan Ministry of Defense and Ministry of Interior declined to comment on the allegations. But when reached by telephone, Abdullah, the militia commander, acknowledged killing the men. “I killed these three people,” he said when asked about them by name. “Those three were Taliban.” He also claimed that he has received, and continues to receive, backing from the U.S. special forces for his unofficial militia. “Everything is provided by the foreigners, including the weapons, salaries and other equipment.”
You can read the full article here: http://america.aljazeera.com/articles/2014/7/23/exclusive-a-killinginandar.html