Oxfam says its sources reported reports of bombing and heavy fighting in South Sudan . The aerial attack comes a day after a refugee camp was bombed . Those two states , along with the Nuba Mountain region , straddle Sudan and South Sudan 's ethnic and political lines . The EU foreign policy chief urged the Sudanese Armed Forces to halt its air attacks .
Oxfam says its sources reported reports of bombing and heavy fighting in South Sudan . The aerial attack comes a day after a refugee camp was bombed . The EU foreign policy chief urged the Sudanese Armed Forces to halt its air attacks .