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Allied jets in Iraq Wednesday targeted a complex of bunkers and tunnels that was uncovered by chance in an earlier U.S. strike.

The bunkers were found when Islamic State of Iraq & Al-Sham jihadists were seen withdrawing to the area, between the Kurdish-held city of Kirkuk and ISIS-held Mosul, during a concerted attack by Kurdish peshmerga and Iraqi government forces.

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A U.S. aircraft struck an ISIS vehicle and at the same time blew a hole in the ground, revealing what appeared to be a large bunker complex underneath.

Military sources said the U.S. strike also caused smoke to billow from holes more than 20 or 30 metres away, suggesting the complex extended some way underground.

Drones and other surveillance planes were sent to scout out its dimensions, before a joint air force was called in to destroy it.

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The U.S.-led military coalition has been launching air strikes against ISIS positions in Iraq and Syria since early August.