The United States is preparing a huge high-tech surveillance operation against Osama bin Laden, in case he breaks cover in the face of an imminent manhunt involving thousands of Pakistani and American troops. US commanders and intelligence chiefs are lining up an array of spy satellites, U2 spy planes, Predator drones, and ground-scattered listening devices and sensors to detect vehicle movements, Bush administration officials told CNN television. The United States has block-booked satellite capacity to handle the mass of data expected from the surveillance effort concentrated on the mountainous border region between Afghanistan and Pakistan. After a two-year manhunt without...