A bomb hit a pipeline carrying oil from Iraq to Turkey on Sunday, stopping exports, a police officer and a senior official from the North Oil Company said.
The official said a maintenance team was sent to conduct repairs.
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There have been about 30 attacks on the pipeline so far this year, the official added.
The 970-kilometre (600-mile) pipeline runs from Iraq's northern oil hub of Kirkuk to the port of Ceyhan on Turkey's Mediterranean coast.
But saboteurs in both Iraq and Turkey have repeatedly disrupted exports through the pipeline.