TIMELINE: Tensions between Sudan and Chad

(Reuters) - Darfur rebel leader Khalil Ibrahim said on Monday he would launch more attacks on Sudan's capital Khartoum until the government fell.

Sudan has said neighboring Chad was backing the rebels.

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.

December 18 - Chad says its forces killed about 300 rebels after they launched a failed offensive on the border town of Adre. Sudan denies involvement.

Jan 8, 2006 - Chad demands Sudan disarm Chadian rebels in Darfur as a condition for peace talks.

Feb 8 - Chad and Sudan agree to put an end to their dispute at a meeting in Libya.