UN Secretary General Ban Ki-moon has sacked the commander of the UN force in South Sudan after a report said it had failed to protect civilians in July. <br/><br/><br/>The report backed claims by aid workers that the UN troops refused to respond when government soldiers attacked an international aid compound in Juba. In the fighting between the army and former rebels, a local journalist was killed and aid workers were reportedly raped. <br/><br/>The clashes derailed efforts to form a unity government and end the civil war. The fighting began with clashes between President Salva Kiir's guards and bodyguards of the sacked Vice-President Riek Machar.<br/><br/>UN spokesman Stephane Dujarric said, Mr Ban has asked for the immediate replacement of the force Commander Kenyan Lt Gen Johnson Mogoa Kimani Ondieki. The independent special investigation into the violence on 8-11 July in South Sudan's capital was commissioned by the UN.