Hundreds of Al Qaeda operatives are in hiding throughout the United States planning potentially catastrophic attacks, and the FBI does not know who or where many of them are, FBI Director Robert S. Mueller III told lawmakers Tuesday. Mueller’s warning was the latest in a flurry of dire pronouncements from top counterterrorism officials, all but predicting attacks against Americans both overseas and on U.S. soil. CIA Director George J. Tenet, appearing alongside Mueller on Capitol Hill, said the government’s recent decision to alert the nation of a “high risk” of terrorist attacks was based on intelligence reports that are “the most specific we have seen,” including indications that Al Qaeda might be planning to use chemical, biological and radioactive weapons. Full Story