The head of an international group monitoring South Sudan's peace process says people are starving in the country's Western Equatoria state as the government and rebels delay forming a transitional government.

Former Botswana President Festus Mogae said a ceasefire monitoring team that recently visited Western Equatoria state found starving people in the Mundri area, which has been a hotspot of violence in recent months.

Mogae told a meeting of government and rebel representatives Tuesday that he is "staggered that things have been allowed to get this bad."

South Sudan President Salva Kiir and rebel leader Riek Machar missed a deadline last month to form the new government as called for in the August peace agreement.