Excerpts (go to the link above for the full article) :
At that time, the US was throwing money at anyone who could deliver an out-of-town Arab found in the region. Nabil was sold to the US for a bounty of $5,000 and taken to an underground prison in Kabul. There he experienced torture for the first time. To house the prisoners of its war on terror, the US military put up a makeshift prison at Bagram air base in Afghanistan. Bagram would quickly become notorious, and make Guantánamo look like a church camp. When Nabil arrived there in January 2002, as one of the first prisoners, there were no walls, only razor-wire cages. In the bitter cold, Nabil was forced to sleep on concrete floors without cover. Food and water were scarce. To and from his frequent interrogations, Nabil was beaten by US soldiers and dragged up and down concrete stairs. Other prisoners died. After a month in Bagram, Nabil was transferred to a prison at Kandahar, where the abuse continued.
Throughout his incarceration in Afghanistan, Nabil strenuously denied any connection to al-Qaida, the Taliban or anyone or any organisation remotely linked to the 9/11 attacks. And the Americans had no proof of his involvement, save for bogus claims implicating him from other prisoners extracted in a Kabul torture chamber. Several US interrogators told him his was a case of mistaken identity. Nonetheless, the US had adopted strict rules for Arabs in custody – all were to be sent to Guantánamo. On 15 February 2002, Nabil was flown to Cuba; shackled, bound and hooded.