One year after mass violence broke out in South Sudan, battles between government forces and rebels continue, and aid officials say international assistance is needed to help residents stave off hunger.

Government troops and armed youths have been battling in Upper Nile state in recent days, a sign that widespread violence could return with the end of the six-month rainy season. Several peace deals have been signed but none have held since fighting began in the capital, Juba, one year ago.

The International Committee of the Red Cross said Sunday that concern about South Sudan is waning internationally and that the country risks becoming "yet another forgotten state."

Human Rights Watch said the cycle of ethnic revenge killings creates an urgent need to hold those responsible to account.