PakistanUS drones kill 12 NWA, big challenge for PakistanNasir KhanMay 16, 2011May 17, 2011 by Nasir KhanMay 16, 2011May 17, 2011 Miranshah: United States US unmanned drones carried out two missile strikes in separate areas of North Waziristan, the tribal area of Pakistan, killing at least...