KHARTOUM, May 10 (Reuters) - Sudan has imposed an overnight curfew in the capital Khartoum after Darfur rebels attacked a suburb on Saturday, state television said.

"We are announcing a curfew in the state of Khartoum from 5 p.m. (1400 GMT) until 6 a.m. starting from today May 10th, 2008," an army spokesman said on state television.

Heavy gunfire was heard by residents in the western suburb of Omdurman on Saturday. Attack helicopters and army vehicles headed to the scene. (Reporting by Opheera McDoom; editing by Sami Aboudi)

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