Attacks across Iraq, including a suicide bombing targeting army officers and a drive-by shooting, have killed at least 10 people, officials said.
In Baghdad, gunmen in a speeding car opened fire at a checkpoint run by anti-al Qaida, pro-government Sunni militiamen in Baghdad's western suburb of Abu Ghraib, killing four and wounding three, a police officer said.
The Sunni militia, known as the Awakening Council, was formed by the US forces during the height of the insurgency. They are seen as traitors by the al Qaida local branch and other militant groups.
Meanwhile, a bombing at an outdoor market in the capital's western Jihad neighbourhood killed two civilians and wounded eight, the officer said. In the northern city of Mosul, a suicide bomber attacked an army patrol, killing at least four officers and wounding nine other soldiers, authorities said.
Medical officials confirmed the casualty figures for all attacks.
Insurgents have stepped up attacks across Iraq in the past months, sending violence to levels not seen since 2008, when sectarian killings nearly tore the country apart in the wake of the US-led invasion.
Sunday's attacks brought the total number of people killed so far this month to 486, according to an Associated Press count.
The United Nations estimates that more than 8,000 people have been killed since the start of the year as insurgents seek to undermine government efforts to maintain security nationwide.