The conflict in Sudan has created the "largest and the most devastating humanitarian crisis in the world" as the warring parties lay siege to towns and block aid deliveries, top aid officials told the U.

The head of the U.N. children's agency says the war in Sudan has created the world’s largest and most devastating humanitarian crisis, with over 30 million people needing aid this year – 16 million of them children.

Sudan is now the largest and most devastating humanitarian crisis in the world, nearly two years into a conflict that has pushed the country to the brink of collapse, a UN official has said.