A senior FBI official, speaking on condition of anonymity, said some of the leads were culled from interviews with thousands of individuals that agents have conducted in the Muslim community. The official would not be more specific, but said the FBI continues to have misgivings about possible Al Qaeda intentions to launch an attas for the person who warned the CIA, at least some of that individual's reporting no longer is seen as credible, said a U.S. intelligence official, speaking on condition of anonymity. The official stressed, however, that a number of other sources point to terrorist activity around the...