Source:
Observer UKHamid Karzai's desperation for a "Good Friday agreement for Afghanistan" led officials to ignore repeated warnings from their own spy chief that they should not trust a man who orchestrated a humiliating face-to-face meeting between the Afghan president and a shopkeeper who pretended to be the Taliban's second most powerful leader.
Amrullah Saleh, the former head of the National Directorate of Security (NDS), Afghanistan's equivalent of MI5, said his agency first vetted the man, who claimed to be a representative of Mullah Akhtar Mohammad Mansour, one of the highest-ranking figures in the Taliban, in mid-2008, but rejected him after he was unable to prove his credentials.
However, the go-between, who said he was a Taliban leader from Kandahar called Muhammad Aminullah, subsequently approached the interior minister, Hanif Atmar, the following year and was enthusiastically embraced by an Afghan government desperate for a breakthrough in peace talks.
Saleh, a highly regarded administrator who was sacked by Karzai earlier this year, said all his warnings were ignored. "I tried time and again to convince my colleagues in the ministry and subsequently at the palace that he is not a genuine representative of anybody," he told the Observer.
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http://www.guardian.co.uk/world/2010/nov/28/afghanistan-leaders-security-karzai