BAGHDAD, Oct 10 (Reuters) - Militants fired mortar rounds at Camp Victory, the U.S. military's sprawling headquarters near Baghdad airport, after dusk on Wednesday but there were no immediate reports of injuries, a U.S. military official said.

A Western security contractor at the base said he heard nine mortar rounds being fired and four explosions inside the perimeter. He was not aware of any casualties.

Such attacks on the base are relatively rare. Last month, an Iranian-made rocket killed one person in an attack blamed on militants loyal to anti-American Shi'ite cleric Moqtada al-Sadr.

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