A series of bombs targeting the homes of Iraqi police has killed two children and wounded nine other people.
A total of six explosions were caused by roadside bombs planted near houses belonging to security officers in Baqouba as their families were sleeping. The city, 35 miles from Baghdad, is a former al-Qa'ida stronghold.
Iraq has warned of a resurgence of Sunni and Shiite militants and an increase in violence following the US troop withdrawal, which ended last month.
The latest violence comes amid a growing political crisis that erupted after Prime Minister Nouri al-Maliki's government issued an arrest warrant for the country's top Sunni politician last month.
Mr al-Maliki's main political rivals, the Sunni-backed Iraqiya bloc, is boycotting parliament sessions and cabinet meetings in protest at what they say are efforts by the Shiite-led government to consolidate power and marginalise them.