"Report: Bush admin. skirted probe of mass Afghan slayings"
http://rawstory.com/08/news/2009/07/10/bush-probe-...
When CIA-backed Afghan warlord Abdul Rashid Dostum had up to ’several thousand’ Taliban prisoners sealed and suffocated to death in metal shipping containers just days after the United States invaded the country, it did not go unnoticed by the White House.
They simply chose not to do anything about it and quietly worked to discourage efforts to uncover the truth, according to a late-Friday report by The New York Times.
"U.S. Said to Have Averted Inquiry Into ’01 Afghan Killings"
http://www.nytimes.com/2009/07/11/world/asia/11afg...
American officials had been reluctant to pursue an investigation — sought by officials from the F.B.I., the State Department, the Red Cross and human rights groups — because the warlord, Gen. Abdul Rashid Dostum, was on the payroll of the C.I.A. and his militia worked closely with United States Special Forces in 2001, several officials said. They said the United States also worried about undermining the American-supported government of President Hamid Karzai, in which General Dostum had served as a defense official.
For background info on this see the following:
"Afghan Massacre - Convoy of Death"