At least six suspected militants have been killed in U.S. drone attack in Pakistan's North Waziristan tribal area. <br/><br/>Local TV channel report said a U.S. surveillance plane fired two missiles at a house in the North Waziristan area of Deegan, where at least six militants were killed and four others injured.<br/><br/>It was the 8th U.S. air strike this month in the tribal area, which Washington considers as the center of Taliban and al-Qaeda militants.<br/>