As chairwoman of the Senate Intelligence Committee, Dianne Feinstein (D-Calif) should probably know better than to think aloud during public hearings. But that’s what she did yesterday, disclosing that U.S. Aerial drones—which have bombed Taliban fighters in northern Pakistan—are actually flying out of a base in Pakistan. The leak could prove difficult for Islamabad, as the matter of co-operation with Washington remains an explosive issue across the country. The drones are said to cause civilian casualties, and U.S. troops or intelligence officials are not supposed to be operating inside Pakistan’s borders. Indeed, the Pakistani government has lodged diplomatic protests over the bombings, arguing they are a violation of sovereignty.