Karzai aide blames British for bringing Taliban impostor to talks - AP

KABUL - President Hamid Karzai's chief of staff on Thursday said that British authorities were responsible for bringing a Taliban impostor into the presidential palace and that foreigners should stay out of delicate negotiations with the Afghan insurgent group.

The false Mansour was "the Brits' guy," said a senior American official familiar with the case. "It was the British who brought him forward." - Karzai aide blames British for bringing Taliban impostor to talks
Taliban impostor reveals perils of negotiation