A number of high-value targets, including Omar, have moved into Karachi from a region near the Pakistan-Afghanistan border, where the Pakistani military and suspected U.S. drones have battled Taliban militants, a senior U.S. official said.Bergen said the operation suggests the Pakistanis are willing to move not only against the Pakistani Taliban but also against the Afghan Taliban, which has its headquarters in Pakistan Baradar also would have been in regular contact with Omar, Bergen added.