Members of the Murle tribe attacked groups of Lou Nuer , the governor of Jonglei state says . The attack took place in a remote area called Ngombe where there are no roads and few people to protect them. In December , 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 state says . The U.N. peacekeeping mission says it had reports of attacks , but ca n't confirm how many died . In December , Lou Nuer killed hundreds of Murle in a series of attacks .