A woman holds South Sudan's national flag during referendum results celebrations in Abyei
A woman holds South Sudan's national flag during referendum results celebrations in Abyei October 31, 2013. Permanent residents of the disputed Abyei region overwhelmingly voted to join South Sudan on Thursday in a symbolic referendum that could antagonise heavily armed Arab nomads who drive their livestock through the area and claim it for Sudan. REUTERS/Goran Tomasevic (ABYEI - Tags: POLITICS ELECTIONS CIVIL UNREST)
Men sing and dance as they celebrate referendum results in Abyei
Men sing and dance as they celebrate referendum results in Abyei October 31, 2013. Permanent residents of the disputed Abyei region overwhelmingly voted to join South Sudan on Thursday in a symbolic referendum that could antagonise heavily armed Arab nomads who drive their livestock through the area and claim it for Sudan. REUTERS/Goran Tomasevic (ABYEI - Tags: POLITICS ELECTIONS CIVIL UNREST)
A man holds South Sudan's national flag as he celebrates referendum results in Abyei
A man holds South Sudan's national flag as he celebrates referendum results in Abyei October 31, 2013. Permanent residents of the disputed Abyei region overwhelmingly voted to join South Sudan on Thursday in a symbolic referendum that could antagonise heavily armed Arab nomads who drive their livestock through the area and claim it for Sudan. REUTERS/Goran Tomasevic (ABYEI - Tags: POLITICS ELECTIONS CIVIL UNREST)
A man dances as he celebrates referendum results in Abyei
A man dances as he celebrates referendum results in Abyei October 31, 2013. Permanent residents of the disputed Abyei region overwhelmingly voted to join South Sudan on Thursday in a symbolic referendum that could antagonise heavily armed Arab nomads who drive their livestock through the area and claim it for Sudan. REUTERS/Goran Tomasevic (ABYEI - Tags: POLITICS ELECTIONS CIVIL UNREST)
A man holds South Sudan's national flag as he celebrates referendum results in Abyei
A man holds South Sudan's national flag as he celebrates referendum results in Abyei October 31, 2013. Permanent residents of the disputed Abyei region overwhelmingly voted to join South Sudan on Thursday in a symbolic referendum that could antagonise heavily armed Arab nomads who drive their livestock through the area and claim it for Sudan. REUTERS/Goran Tomasevic (ABYEI - Tags: POLITICS ELECTIONS CIVIL UNREST)
A man dances as he celebrates referendum results in Abyei
A man dances as he celebrates referendum results in Abyei October 31, 2013. Permanent residents of the disputed Abyei region overwhelmingly voted to join South Sudan on Thursday in a symbolic referendum that could antagonise heavily armed Arab nomads who drive their livestock through the area and claim it for Sudan. REUTERS/Goran Tomasevic (ABYEI - Tags: POLITICS ELECTIONS CIVIL UNREST TPX IMAGES OF THE DAY)
A woman waves South Sudan's national flag as she celebrates referendum results in Abyei
A woman waves South Sudan's national flag as she celebrates referendum results in Abyei October 31, 2013. Permanent residents of the disputed Abyei region overwhelmingly voted to join South Sudan on Thursday in a symbolic referendum that could antagonise heavily armed Arab nomads who drive their livestock through the area and claim it for Sudan. REUTERS/Goran Tomasevic (ABYEI - Tags: POLITICS ELECTIONS CIVIL UNREST TPX IMAGES OF THE DAY)
Thousands in contested Abyei vote to join South Sudan, risking tensions
The ownership of Abyei was left undecided when South Sudan declared independence from Sudan in 2011
People wave South Sudanese flags as they celebrate referendum results in town of Abyei
People wave South Sudanese flags as they celebrate referendum results in town of Abyei October 31, 2013. Thousands of residents in the region took part in a three-day vote whose result will be non-binding but would indicate whether Abyei wants to join Sudan or South Sudan. REUTERS/Goran Tomasevic (ABYEI - Tags: CIVIL UNREST POLITICS ELECTIONS TPX IMAGES OF THE DAY)