Police officials say the deadliest attack took place this afternoon when two suicide bombers set off their explosive belts inside a Shiite militia headquarters in the town of Mishada, 30 kilometers north of Baghdad, killing seven Shiite militiamen and wounding 20 others.
Shiite militias have been fighting alongside government forces against the Islamic State, a Sunni extremist group that seized vast swaths of northern and western Iraq last year.
In a separate attack, gunmen in a speeding car opened fire on soldiers manning a checkpoint in Baghdad's western suburb of Abu Ghraib, killing three soldiers and wounding eight others, police officials said.
In the town of Tarmiyah, north of Baghdad, a suicide bomber drove his explosives-laden car into an army checkpoint, killing three soldiers and wounding nine others.
More From This Section
Medical officials confirmed the casualties. All officials spoke on condition of anonymity because they were not authorized to speak to journalists.
Iraqi lawmakers meanwhile approved a 2015 budget of 119 trillion Iraqi dinars (about USD 102 billion), with a deficit of 25 trillion dinars (about USD 21.4 billion). The budget calculations are based on an assumed oil price of USD 56 a barrel.
Iraq has the world's fourth largest oil reserves, and oil revenues make up nearly 95 per cent of its budget. The price of oil has fallen by about half since June to around USD 55 per barrel.