South Sudan's Yida refugee camp was bombed earlier this week, leaving at least twelve people dead.
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.
The camp, located on the border with Sudan, is also facing critical water shortages.
Khartoum denies US accusations that the north carried out the attack, just as UN food aid was being delivered.
Al Jazeera's Anna Cavell reports from Yida.