The United Nations food agency on Saturday warned South Sudan risked famine due to the conflict between the government and rebels and appealed for free access for humanitarian supplies along roads and rivers. \"Some areas of the country appear to be at high risk of famine in the coming months,\" the Rome-based Food and Agriculture Organisation (FAO) said in a statement following an assessment carried out in April and May. With a ceasefire due to come into force on Saturday, the FAO said hunger had been caused by \"displacement, destroyed markets and disrupted livelihoods\" since fighting first broke out in December last year. \"There is a small window of opportunity to prevent this terrible crisis from deteriorating into catastrophe,\" said Sue Lautze, FAO's head of ****** in South Sudan.