Khartoum: Sudan's chief peace negotiator said on Sunday that a main Darfur rebel group, Justice and Equality Movement, was "not serious" about reaching a final settlement with the government.
"We have committed to finalising an agreement between now and April 5," Ameen Hassan Omar told reporters in Khartoum.
"But JEM is not serious about reaching a peace agreement," he said, accusing the group of violating the ceasefire and failing to free prisoners despite a pledge to do so.
JEM, one of two key Darfur rebel groups along with the Sudan Liberation Army faction of Abdul Wahid Noor, signed a framework accord in February in Qatar that was hailed by the international community as a major step towards bringing peace to the western region of Sudan devastated by a seven-year war.
Shortly afterwards, the Khartoum government signed a framework peace deal in Doha with the Liberation and Justice Movement, another rebel group that forms an alliance of splinter factions.
Senior Sudanese officials at the time urged JEM to engage in "serious and sincere" talks to reach a final agreement.
Omar on Sunday insisted the Sudanese authorities had not re-arrested 15 JEM rebels last week, as alleged by their lawyer, after releasing them following the wavering truce.
