Seven international aid agencies warned Wednesday of worsening humanitarian situation in Sudan and South Sudan and called on the international to scale up response.

Operations Director of the UN Office for the Coordination of Humanitarian Affairs (OCHA) John Ging cited an urgent need to mobilize funding for the crisis in Sudan, where some 6.1 million people currently need assistance, a 40 percent increase over this time last year.

"The people of Sudan are facing an overwhelming humanitarian crisis that has almost entirely slipped off the international community's radar," Ging said in a statement received in Nairobi on .

The agencies -- FAO, UNICEF, WHO, UNHCR, IOM, OCHA and Danish Refugee Council -- expressed deep concern about the massive and growing humanitarian needs in Sudan and the conflict devastating South Sudan and its people.

According to UN, malnutrition and food insecurity are escalating at an "alarming" rate, with some 500,000 children affected.

The situation is particularly dire in Darfur, where renewed violence is displacing larger and larger numbers of civilians ?C almost 400,000 newly displaced in 2013, and almost 200,000 more so far this year.

He added that the situation in Sudan requires an end to conflict and a more generous response from the international community.

So far this year, the UN and partners have only received 3 percent of the 995 million US dollars requested for humanitarian activities in Sudan.

Ging said that the emergency directors engaged in a constructive dialogue with Sudanese authorities and emphasized the need for greater access for humanitarian organizations particularly in Darfur, South Kordofan and Blue Nile States.