Iraqi jets have dropped thousands of leaflets over Huwaijah and Shirqat, activists on Facebook and Twitter said on Friday.
By these leaflets, the Iraqi forces have called on ISIS terrorists entrenched in the two cities to lay down arms and capitulate.
The Iraqi forces have accomplished preparations for a fresh offensive against ISIS to retake Huwaijah and the areas neighboring provinces of Salahuddin and Kirkuk.
Sources say the Iraqi army mobilized 40, 000 fighters provided with sophisticated weaponry.
They added US tanks will partake in the battle which will be covered from land by artillery as well as air support.