Members of the Murle tribe attacked groups of Lou Nuer , the governor of Jonglei , says . The UN peacekeeping mission says it had reports of deaths , but it n't confirm how many died . Manyang , who is a member of the Dinka tribe , said the Murle crossed from Pibor County , in Jonglei , into neighboring Ethiopia , then traveled north before re-entering South Sudan to carry out the attacks . In 2005 , Lou Nuer killed hundreds of Murle in a series of attacks .
Members of the Murle tribe attacked groups of Lou Nuer , the governor of Jonglei , says . The UN peacekeeping mission says it had reports of deaths , but it n't confirm how many died . In 2005 , Lou Nuer killed hundreds of Murle in a series of attacks .