Libyan army Chief of Staff Yussef al-Mangush speaks during a memorial service in Dahra district of central Bani Walid, about 180km southeast of Tripoli, Libya, Dec. 16, 2012. Three members of the Libyan national army were killed and nine others wounded in an armed attack Saturday night in the city of Bani Walid, an army spokesman told Xinhua. [Xinhua]