The rebel Sudan Liberation Movement has not said whether it would be going to talks in Addis Ababa with the government, as the UN announced last Friday.
The other main rebel group, the Justice and Equality Movement, said on Saturday there would be no talks with the government until the Janjaweed were disarmed.
Jailed Sudanese Islamist leader Hassan al-Turabi, 72, accused of inciting rebels in Darfur, was taken to hospital after eating nothing but dates to protest his detention, said his daughter Omama.
Once a powerful figure in President Omar Hassan al-Bashir's government, Turabi was detained at the end of March when authorities accused him of inciting tribal tensions and said his opposition Popular National Congress had funded rebels.
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