The Central Intelligence Agency pulled its top spy out of Pakistan, citing threats to his life after a lawsuit revealed his name and accused him of helping to orchestrate the agency's campaign of drone missile strikes in the country. Officials said the agency is looking into the possibility that Inter-Services Intelligence agency, the ISI, may have had a role in blowing the CIA station chief's cover, a sign of tensions in relations. The White House has voiced frustration with Pakistan in recent months over its refusal to crack down more decisively on militants on its territory. A White House review of the Afghan war strategy, released Thursday, said lasting war gains depended on eliminating militant havens in Pakistan. The station chief in Islamabad is one of the CIA's most critical and sensitive assignments. The chief oversees the agency's covert programs, including the drone campaign. The program targets al Qaeda and Taliban leaders as well as fighters who cross the border into Afghanistan to fight American and Western forces there. The drone strikes are unpopular in Pakistan, but officials say the government and ISI secretly support them by providing the U.S. with intelligence used to pinpoint militant targets. U.S. officials said the departure of the station chief won't disrupt the pace of drone strikes, which the CIA has ramped up in recent months. On Friday, three missile attacks killed 54 alleged militants close to the Afghan border, an unusually high number of victims that included commanders of a Taliban-allied group that were holding a meeting, Pakistani officials said, the Associated Press reported. The CIA station chief, who was working undercover, left Islamabad on Thursday and returned to the U.S., officials said. A U.S. intelligence official said the CIA decided to pull the station chief out of the country after concluding "terrorist threats against him in Pakistan were of such a serious nature that it would be imprudent not to act." The station chief was named in a legal complaint filed recently in Pakistan that alleged that CIA drones killed civilians. U.S. officials say the strikes kill scores of militants and few civilians. The complaint also named Leon Panetta, the CIA chief, and Defense Secretary Robert Gates in the case. After the complaint was filed, several dozen people from the tribal regions whose family members were allegedly killed in missile strikes demonstrated outside the Supreme Court and Parliament demanding action. They carried placards bearing the name of the station chief and calling for his expulsion. The legal complaint identified the station chief's name, though the spelling was inaccurate. The name was picked up and reported in Pakistani media. George Little, a CIA spokesman, said station chiefs "routinely" face major risks and have been targeted by terrorists in the past. U.S. officials say ties between the CIA and ISI have expanded in recent years, but tensions remain, particularly over U.S. assertions that elements of the Pakistani spy agency still provide support to the Taliban and some of their allies. Pakistani officials in Washington didn't respond to a request to comment.(WSJ)