On 20 February 2017 South Sudan and the United Nations declared a famine in parts of former Unity State, with the warning that it could spread rapidly without further action. Over 100,000 people were affected. The UN World Food Programme said that 40% of the population of South Sudan, 4.9 million people, need food urgently. U.N. officials said that President Salva Kiir Mayardit was blocking food deliveries to some areas. Furthermore, UNICEF warned that more than 1 million children in South Sudan were subjected to malnutrition.