The protracted rise in violence, which has seen at least 500 people killed already this month, has fuelled fears Iraq is on the brink of plunging back into the brutal Sunni-Shiite sectarian war that plagued it years ago.
Officials have also voiced concern over a resurgent Al-Qaeda emboldened by the civil war in neighbouring Syria, which has provided jihadist fighters in Iraq with rear bases to plan operations.
Today's attacks struck the capital and predominantly Sunni Arab areas north of Baghdad that have borne the brunt of the worsening unrest, which has killed more than 5,900 people this year.
Elsewhere in the capital, a car bomb targeting a police station killed four policemen, while another bombing, this one targeting Sahwa anti-Al-Qaeda militiamen, killed one fighter and wounded four.
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From late 2006 onwards, Sunni tribal militias, known as the Sahwa, turned against their co-religionists in Al-Qaeda and sided with the US military, helping to turn the tide of Iraq's insurgency. Sunni militants view them as traitors and frequently target them.
In the northern city of Mosul, a car bomb in a residential area killed five people, while a magnetic "sticky bomb" attached to a car killed its driver.
Another vehicle rigged with explosives was set off at a joint checkpoint manned by the Iraqi army and the Kurdish peshmerga security forces. Two peshmerga fighters and a soldier were killed.
In the restive city of Baquba north of Baghdad a Shiite man was killed by a "sticky bomb" attached to his car.
In the lone reported attack south of the capital, meanwhile, a former lawmaker was gunned down in his home.