South Sudan's Yida refugee camp was bombed earlier this week, leaving at least twelve people dead.<br /><br />Following the attack, most aid workers pulled out of the camp, and the people left behind do not know where they will get medicines from.<br /><br />The camp, located on the border with Sudan, is also facing critical water shortages.<br /><br />Khartoum denies US accusations that the north carried out the attack, just as UN food aid was being delivered.<br /><br />Al Jazeera's Anna Cavell reports from Yida.