A South Sudan army soldier stands next to a machine gun mounted on a truck in Malakal town, 497km (308 miles) northeast of capital Juba, December 30, 2013 a few days after retaking the town from rebel fighters. South Sudanese troops clashed with ethnic Nuer “White Army” militia and other rebel factions loyal to former Vice President Riek Machar late on Monday near the flashpoint town of Bor, government officials said. REUTERS/James Akena (SOUTH SUDAN – Tags: POLITICS CIVIL UNREST MILITARY CONFLICT TPX IMAGES OF THE DAY)