Two young sons of Khalid Sheikh Mohammed, the suspected mastermind of the September 11 attacks, are being used by the CIA to force their father to talk. Yousef al-Khalid, nine, and his brother, Abed al-Khalid, seven, were taken into custody in Pakistan last September when intelligence officers raided a flat in Karachi where their father had been hiding. He fled just hours before the raid but his two young sons, along with another senior al-Qaeda member, were found cowering behind a wardrobe in the apartment. The boys have been held by the Pakistani authorities but this weekend they were flown...