Chad closed its border with Sudan and suspended economic ties a day after Sudan cut diplomatic relations with the neighbouring country following a rebel attack near Khartoum.

Chad's government has denied all allegations made by Sudan that it backed rebels who raided the Sudanese capital on May 10.

"The government denies all involvement in this adventure that it condemns without reservation," Chadian government spokesperson Mahamat Hissene said in a statement, as cited by BBC.

Sudan cut relations with Chad following the attack by rebels allied with the Justice and Equality Movement (JEM) from Sudan's Darfur region, the first time in the five-year conflict in Darfur that fighters have reached the heavily-defended capital.

Security and political analysts believe Chad's relationship with the JEM was forged in 2005 when Chadian President Idriss Deby switched his support from forces allied with the Sudanese government in Khartoum to anti-Sudanese forces.

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