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The United Nations is warning that it\\\'ll investigate reports of crimes against humanity in South Sudan.

The warning comes after eyewitnesses unveiled a wave of brutal ethnic killings. UN chief Ban Ki-moon says all those responsible for the killings will face the consequences. He has asked the Security Council to nearly double the size of the UN mission in South Sudan. Since nearly a week ago, the country has been hit by deadly fighting between government forces and rebels loyal to former vice president, Riek Machar. According to official estimates, 500 people have lost their lives in the week long conflict. But independent sources believe the real figure to be higher.