Hunger has surged in the Democratic Republic of Congo, with 400,000 children at risk of starving to death due to conflict, displacement and funding shortages, aid agencies said.

Militia fighting that broke out in Congo's central Kasai region last year has led to an eight-fold increase in hunger, leaving 3.2 million people short of food, the United Nations (U.N.) Office for the Coordination of Humanitarian Affairs said.

"Vicious conflict has left millions of people in Kasai severely hungry and the world cannot continue to ignore this scale of human suffering," Jose Garcia Barahona, the British charity Oxfam's country director, said in a statement.