Residents and aid workers say the United Nations has not registered the more than 11,000 people who have sheltered at its sites in South Sudan's capital since renewed fighting nearly a month ago.

People cannot qualify for U.N. rations without the registration, which drives them to seek food outside the main U.N. camp. Witnesses say dozens of women and girls returning to the camp with food have been the target of rapes and gang rapes.

A community leader sheltering at the main U.N. camp, Zacharia Buok, said Wednesday that new arrivals haven't been registered at all.

A U.N. official in charge of camp management, Derk Segaar, says registration of the new arrivals has been planned.

The U.N. humanitarian chief, Stephen O'Brien, was visiting Juba on Wednesday.