Three blasts went off along the pipeline, in Nineveh province, which runs to the Turkish port of Ceyhan, according to two security officials.
They did not cause any casualties.
An official with the state-owned North Oil Co in the city of Kirkuk said the suspension was caused by a technical fault, and said repairs were being carried out on the pipeline, with pumping expected to resume tomorrow.
Militants frequently attack the pipeline, which ferries a significant portion of Iraq's oil exports to international markets.
Officials are aiming to increase production capacity to nine million bpd by 2017, a target that the International Monetary Fund and International Energy Agency have warned is over-optimistic.
