Sudan's Rapid Support Forces signed a charter with allied political and armed groups late on Saturday to establish a "government of peace and unity", signatories al-Hadi Idris and Ibrahim al-Mirghani told Reuters.

The RSF has seized most of the western Darfur region and swathes of the Kordofan region in an almost-two-year war, but it is being pushed back from central Sudan by the Sudanese army, which has condemned the formation of a parallel government.

Sudan has condemned Kenya for hosting a meeting led by the rebels, and the UN is warning the move could further divide the war-torn country.

Sudan's paramilitary Rapid Support Forces and its allies have agreed to set up a parallel government, sources said Sunday, despite warnings such a move could further fragment the war-ravaged country.