The world is facing the worst humanitarian crisis since 2nd World War - UN

 The United Nation's humanitarian chief  has cautioned that the world is facing the worst humanitarian crisis ever since the end of  the Second World War, with more than 20 million people facing

famine and starvation especially in four countries and if immediate measures are not taken, the outcome will be disastrous the world.

 Stephen O'Brien   has appealed for an urgent mobilization of funds -- $4.4 billion by July -- for northeastern Nigeria, Yemen, South Sudan, and Somalia to "avert an impending catastrophe."

O'Brien said; "Otherwise, many people will predictably lose their lives from hunger, livelihoods will be lost and political gains that have been hard won over the last few years will be reversed," He said in his stark warning to the United Nations Security Council.

"If we don't adopt collective and coordinated global efforts, many people will simply starve to death. Much more is likely to suffer and die from diseases. Children stunted and out of school. Livelihoods, futures and hope will be lost."

He also called Yemen "the largest humanitarian crisis in the world now" with two-thirds of the population, or 18.8 million people -- 3 million more than in January -- in need of assistance and more than 7 million with no regular access to food and water.

The confusion that is going on in Yemen has left not less than 7,400 people dead and 40,000 seriously wounded since an Arab-state coalition intervened on the government's side against rebels in March 2015, according to United Nations figures.

For the past 2 months alone, approximately 48,000 people have fled fighting in the Arab world's poorest country, according to O'Brien, as it grapples with a proxy war fought by archrivals Iran and Saudi Arabia.

He also noted that about 4.9 million people received food assistance last month alone.

"Yet all parties involve in the conflict are denying sustained humanitarian access and politicize aid," he also added.

"The crisis that is taking place in  Yemen today is caused by the parties and proxies and if they don't change their behavior now, they must be held accountable for the inevitable starvation, unnecessary deaths and associated amplification in suffering that will follow soon."

O'Brien also said that despite assurances from all parties that he would obtain safe passage to the flashpoint city of Taiz, he was, in fact, denied access and came under gunfire after retreating to a short distance away.

A total amount of $2.1 billion is currently needed to reach 12 million people with life-saving assistance and protection in Yemen this year, according to the UN Humanitarian Chief, who noted that just 6% of those funds needed have been received so far.