The world faces the largest humanitarian crisis since the United Nations was founded in 1945, the UN's humanitarian chief has warned.

Stephen O'Brien told the UN Security Council that over 20 million people in Yemen, South Sudan, Somalia and northeast Nigeria are facing starvation and famine, according to Sky News.

He said that "without collective and coordinated global efforts, people will simply starve to death" and "many more will suffer and die from disease".

He urged an immediate injection of funds for the four countries plus safe and unimpeded access for humanitarian aid "to avert a catastrophe".

"To be precise, we need $4.4bn (£3.6bn) by July," said O'Brien.

Source: MENA