The United Nations has said that the world is facing its largest humanitarian crisis since 1945, as famine, starvation and terrorism grow.

More than 20 people faced the threat of starvation and famine in Yemen, Somalia, South Sudan and Nigeria, UN humanitarian chief Stephen O’Brien said.

Unicef has also reported that 1.4 million children could starve to death this year.

According to O’Brien, $4.4 billion was needed by July to avert disaster.

“We stand at a critical point in history. Already at the beginning of the year we are facing the largest humanitarian crisis since the creation of the United Nations,” he said on Friday.

“Now, more than 20 million people across four countries face starvation and famine. Without collective and coordinated global efforts, people will simply starve to death. Many more will suffer and die from disease,” he added.

In Somalia, over 6 million people are in dire need of food assistance, as the country suffers the presence of terrorist group Al-Shabaab.

And in Yemen, over 7 million people are severely food insecure, according to the UN.

Saudi Arabia’s aggression against Yemen, which was launched in 2015, has killed at least 11,000 civilians and has left the Arab country in a humanitarian crisis, with millions of people facing water and food shortages.