The lobby of the CIA Headquarters Building in McLean, Virginia, in this August 14, 2008 file photograph. The revelation that militants sought to attack an airliner with an improved "underwear bomb" in a plot foiled by U.S. and allied authorities shows their determination to build bombs that can pass through airport security, U.S. officials said. Senator Dianne Feinstein, chairman of the Senate intelligence committee congratulated the CIA on May 7, 2012 for "thwarting this reported plot by AQAP to destroy a U.S.-bound airliner using a specific type of bomb that is of new design and very difficult to detect by magnetometer." REUTERS/Larry Downing/Files (UNITED STATES - Tags: POLITICS CONFLICT)