The United Nations has warned of the devastating situation in Sudan as hunger and displacement are spiraling out of control as fight is going on between the army and the paramilitary Rapid Support Forces.

More than 6 million people in Sudan, about 13 per cent of the population, are now one step from famine, according to the UN aid agency, OCHA.

Over 20 million people are facing high levels of acute food insecurity due to the conflict, economic decline and mass displacement, OCHA said in a statement.

The war-torn nation has been ravaged again by fighting two decades after a conflict broke out.

The recent fighting since April has killed 3,000 civilians and injured thousands, according to local medics.

Several cease-fire agreements brokered by Saudi and US mediators have failed to end the violence.

More than 334,000 people have been internally displaced in just one week, according to the International Organization for Migration (IOM).

IOM estimates that nearly 3 million people have been displaced by the conflict.