Iraqi Major Emad al-Dulaimi said on Monday that the attack took place on Sunday night near the town of Rutba.
He says the militants were armed with assault rifles and rockets.
It wasn't immediately clear who carried out the attack but al-Dulaimi blamed the Islamic State group.
IS has carried out many similar attacks targeting Iraqi forces in the past months to detract from the ongoing battle between Iraqi forces and Islamic State militants in Mosul.
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Rutba lies about 390km west of Baghdad in the country's vast Anbar province. It's the last sizable town on the way to the border with Jordan.
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