Saboteurs detonated an explosive near an oil pumping station in southern Iraq on Saturday but caused only superficial damage, witnesses said.
Television footage showed damage to a wall surrounding Barjasieh station, around 20 miles south of Basra. There was no sign of damage to pipelines and pumps inside.
Followers of anti-US cleric Moqtada al-Sadr have threatened to attack oil installations in the south, which account for all Iraqi crude exports, in response to a US offensive aimed at crushing their uprising.
A main pipeline in the south has been shut since saboteurs attacked it on August 9, halving the country's exports to one million barrels per day. Gunmen also set fire to the South Oil Company headquarters on Thursday.