Sudan's ambassador to the United Nations says rebels and not the Sudanese army attacked a U.N. - African Union supply convoy in Darfur Monday.

Speaking to reporters Wednesday at U.N. headquarters in New York, Ambassador Abdalmahmood Mohamed said the rebel group Sudanese Justice and Equality Movement was behind the attack.

On Tuesday, a U.N. spokesman said that the convoy had been attacked by elements of the Sudanese army as it traveled between Umm Baru and Tine in western Darfur. A civilian driver was shot seven times in the incident and remains in critical condition.

U.N. Secretary General Ban Ki-moon has condemned the attack in the strongest possible terms and says the United Nations is lodging a protest with the government of Sudan.

Ambassador Mohamed criticized the secretary general for condemning Sudan before a joint Sudan - UNAMID investigation is complete.

Some information for this report was provided by AFP and Reuters.