The bodies of 12 Sunni Muslims have been found near to the Iraqi capital, Baghdad, a day after they were abducted on their way home from work.
Police said at least two people died in a car bomb in east Baghdad
The men, who worked at a bottling plant, were seized at a roadblock set up by suspected Shia militants and then separated from their Shia colleagues.
Some 29 unidentified bodies have also been found on the streets of the capital during the last 24 hours.
Meanwhile, at least eight people died in bomb attacks in Iraq on Monday.
Police said a roadside bomb in the centre of Baghdad killed a passer-by and wounded three others, while two car bombs in the south of the city killed six civilians and an Iraqi soldier.
Reuters news agency reported that nine Iraqi soldiers died and 20 were injured as a roadside bomb detonated as they passed by in a truck in the northern Salahuddin province.
The violence in and around the Iraqi capital is a continuation of the bloodshed of recent days.
At least 240 people were injured in the Amirli attack, many seriously
In a letter to Reuters, an Iraqi insurgent group condemned a powerful truck bomb that hit a marketplace in Amirli, northern Iraq, on Saturday killing at least 130 people.
The letter from a group calling itself the Jihad and Reform Front - said to be an alliance of two major Sunni insurgent groups - could not be immediately verified as authentic.
The sectarian violence comes despite the deployment of an extra 30,000 US troops in Iraq as part of a "surge" strategy designed to increase security.