KHARTOUM, May 11 (Reuters) - Sudan has extended a curfew in Khartoum indefinitely on Sunday saying some Darfur rebels were still on the loose after attacking a western suburb of the capital, the governor of Khartoum said.

"We have lots of wandering defeated fighters ... and we are chasing them and we don't want civilians to get caught in the cross fire," Khartoum state governor Abdel Haleem al-Mutafi told Reuters.

Some fighting could still be heard in the far west of Omdurman in Khartoum state on Sunday morning, witnesses said. (Reporting by Opheera McDoom; editing by Sami Aboudi)

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