May 12 (Reuters) - Sudan has accused neighbouring Chad of backing rebels who attacked the capital Khartoum at the weekend and has cut diplomatic relations. Here is a chronology of recent Chad-Sudan tensions: Jan/Feb 2004 - Thousands of refugees from Sudan's Darfur region arrive in Chad fleeing government bombings and raids by Arab Janjaweed militias. April 9 - Chad brokers a ceasefire between the Sudanese government and two Darfur rebel groups. April 11, 2005 - Chad suspends mediation, accusing Sudan of supporting Chadian rebels. It returns to mediation after promises from Khartoum that it would act against the rebels. Dec. 18 - Chad says its forces killed about 300 rebels after they launched a failed offensive on the border town of Adre. Sudan denies involvement. Feb 8, 2006 - Chad and Sudan agree to put an end to their dispute at a meeting in Libya. April 13 - Chad government forces fight off attack by rebels on the capital N'Djamena. Several hundred people killed. Deby breaks diplomatic relations with Sudan the next day. Aug 8 - Chadian President Idriss Deby and Sudanese President Omar Hassan al-Bashir agree to restore ties. Feb 1, 2007 - Rebels fighting to overthrow Deby launch an attack on Adre, before being beaten back. Feb 22 - At a conference in Libya, leaders of Sudan and Chad pledge to redouble efforts to end border violence. May 3 - Sudan and Chad sign a Saudi-brokered reconciliation deal in Riyadh. Oct 25 - Chad and four Sudan-based Chadian rebel groups sign a "definitive peace accord" in Libya. At least two groups later abandoned the accord. Feb 3, 2008 - Deby beats back rebels who got as far as the presidential palace in an attempt to oust him. Former colonial power France rallies behind Deby. March 13 - Sudanese and Chadian leaders sign non-aggression deal in Senegal however Chadian rebels dismiss the peace pact the next day. May 10 - Rebels make a lightning advance from the western Darfur region to attack Khartoum. About 65 people are believed to have been killed in the attacks. May 11 - Sudan accuses Chad of backing the rebels and cuts diplomatic relations. Chad denies involvement.
A Myanmar Red Cross volunteer forms part of a human chain loading a truck with drinking water for distribution to displaced people in the capital Yangon in this handout photograph taken ...
