Islamic State bombers attacked a natural-gas plant north of Baghdad on Sunday, killing at least 12 people.
It was the fifth straight day of offensive by the extremist group that have left more than 120 people dead, the Wall Street Journal reports, citing officials.
A car bomb exploded at dawn at the gate of the state-owned plant which produces gas for cooking and other purposes.
Eight suicide bombers then entered the facility and clashed with security forces before blowing themselves up, local police officials said.
They set three large gas tanks on fire, damaged one of the production lines and killed several people, the officials said.
The oil ministry said engineers were assessing the damage but that gas output will not be affected.
Islamic State claimed the attack in a statement carried by its affiliated Amaq news agency.
The attack extended a wave of Islamic State violence in urban areas of Iraq, even as military forces beat back the Sunni Muslim extremists elsewhere in the country.
The insurgent group controls large swaths of Iraqi territory, but has lost ground to Iraqi forces backed by a U.S.-led coalition carrying out airstrikes. Iraqi forces have in recent months retaken the cities of Ramadi and Hit in Anbar province.
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