May 11 (Reuters) - Sudan cut diplomatic relations with Chad on Sunday after an attack on the Sudanese capital by Darfur rebels which it said was supported by Chadian President Idriss Deby.

Below is a chronology of some major events in the conflict in western Sudan:

February 2003 - Two rebel groups rise up, saying government neglects arid region and arms Arab militia against civilians.

April 8, 2004 - Government, Sudan Liberation Army (SLA) and Justice and Equality Movement (JEM) rebels agree ceasefire, later agreeing it should be monitored by foreign forces.

May 5, 2006 - Sudan's government and SLA sign new peace deal. Rival SLA faction and the smaller JEM reject the deal.

Aug. 31 - U.N. Security Council votes to create a U.N. peacekeeping force of 26,000 U.N. troops and police in Darfur, but Sudan rejects the idea of foreign troops.

Jan. 10, 2007 - Sudan and Darfur rebels agree to a 60-day ceasefire and a peace summit sponsored by the African Union and United Nations.

Feb 27 - International Criminal Court's chief prosecutor names first two war crimes suspects in Darfur. Sudan says the ICC has no jurisdiction and later rejects arrest warrants.

May 29 - U.S. President George W. Bush imposes new U.S. sanctions on Sudan and asks for support for an international arms embargo to end what he calls genocide in Darfur.

Aug 1 - The U.N. Security Council authorizes 26,000 troops and police for Darfur's hybrid mission and approves the use of force to protect civilians.

Oct 27 - Darfur peace talks open in Libya and the government declares an immediate unilateral ceasefire, but key rebel groups are absent.

Feb. 3, 2008 - Chad's President Idriss Deby survives attack on capital by rebels he says were backed by Sudan. Khartoum denies this.

May 5 - Sudanese government bombs hit primary school and market place in Darfur, killing at least 13 people in latest upsurge of violence.

May 10 - Fighting inside Khartoum. Darfur rebels say they have entered the city.

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