Civilians and rebel fighters stand on a boat in Sobat river in town of Ulang in Upper Nile State
Civilians and rebel fighters stand on a boat in Sobat river in town of Ulang in Upper Nile State February 7, 2014. REUTERS/Goran Tomasevic (SOUTH SUDAN - Tags: CIVIL UNREST POLITICS)
A rebel fighter waves his rifle as he sits with other fighters on a boat in Sobat river in town of Ulang in Upper Nile State
A rebel fighter waves his rifle as he sits with other fighters on a boat in Sobat river in town of Ulang in Upper Nile State February 7, 2014. REUTERS/Goran Tomasevic (SOUTH SUDAN - Tags: CIVIL UNREST POLITICS)
Rebel commander for Upper Nile State General Gathoth Gatkudth listens to his men in the town of Ulang in Upper Nile State
Rebel commander for Upper Nile State General Gathoth Gatkudth listens to his men in the town of Ulang in Upper Nile State, February 7, 2014. REUTERS/Goran Tomasevic (SOUTH SUDAN - Tags: CIVIL UNREST POLITICS)
Civilians and rebel fighters are seen in a boat in Sobat river in town of Ulang in Upper Nile State
Civilians and rebel fighters are seen in a boat in Sobat river in town of Ulang in Upper Nile State, February 7, 2014. REUTERS/Goran Tomasevic (SOUTH SUDAN - Tags: CIVIL UNREST POLITICS)
Civilians and rebel fighters are seen on a boat in Sobat river in town of Ulang in Upper Nile State
Civilians and rebel fighters are seen on a boat in Sobat river in town of Ulang in Upper Nile State February 7, 2014. REUTERS/Goran Tomasevic (SOUTH SUDAN - Tags: CIVIL UNREST POLITICS ELECTIONS)
Civilians and rebel fighters are seen in a boat in Sobat river in town of Ulang in Upper Nile State
Civilians and rebel fighters are seen in a boat in Sobat river in town of Ulang in Upper Nile State, February 7, 2014. REUTERS/Goran Tomasevic (SOUTH SUDAN - Tags: CIVIL UNREST POLITICS)
A rebel fighter sits in a boat in Sobat river in town of Ulang in Upper Nile State
A rebel fighter sits in a boat in Sobat river in town of Ulang in Upper Nile State, February 7, 2014. REUTERS/Goran Tomasevic (SOUTH SUDAN - Tags: CIVIL UNREST POLITICS)
Civilians and rebel fighters are seen on a boat in Sobat river in town of Ulang in Upper Nile State
Civilians and rebel fighters are seen on a boat in Sobat river in town of Ulang in Upper Nile State February 7, 2014. REUTERS/Goran Tomasevic (SOUTH SUDAN - Tags: CIVIL UNREST POLITICS TPX IMAGES OF THE DAY)