Iraqi military and security officials say Islamic State suicide bombings and clashes between the extremist group and Iraqi troops have killed 13 soldiers in western Anbar province.

The officials say Wednesday's attacks involved at least two suicide bombers that targeted a military outpost in the volatile province, which fell to the IS group during the Islamic State's blitz last year.

They said the outpost housed a joint contingent of Iraqi soldiers, policemen and allied Sunni militiamen. Another 13 troops were wounded in the attacks, the latest to hit beleaguered Iraqi forces trying to claw back territory from the IS in the region.

The officials spoke on condition of anonymity because they are not authorized to talk to the media.