Stay alert: The CIA expects al Qaeda to attack the U.S. in the next three to six months. Agency Chief Leon Panetta said Tuesday that the terrorist group is sending new recruits with “clean” records to the U.S. to carry out attacks from inside the country. "The biggest threat is not so much that we face an attack like 9/11. It is that al Qaeda is adapting its methods in ways that oftentimes make it difficult to detect," Panetta said. "It's the lone-wolf strategy that I think we have to pay attention to as the main threat to this country."