LONDON: The CIA has told President Barack Obama that British-born Pakistani terrorists, who have extensive contacts with Lashkar-e-Taiba, are the biggest threat to the US, the Sunday Telegraph reported. American spy chiefs have told the president that the Central Intelligence Agency has launched a vast spying operation in Britain to prevent a repeat of the 9/11 attacks being launched from Britain, the paper said. It said spy chiefs believe that a British-born Pakistani extremist entering the US under a current visa waiver programme for all Britons is the most likely source of another terrorist spectacular on American soil. A former...