Iraqi police say a series of near-simultaneous car bombings in Kirkuk have killed at least 11 people and wounded another 65.
Police in the oil-rich northern city say seven bombs exploded early Sunday. Three were suicide attacks.
In Balad, north of the capital, hospital officials say Shi'ite militiamen have killed at least 40 Sunnis since gunmen killed 14 Shi'ite workers near the city Friday.
In Baghdad Sunday, a roadside bomb killed four people as the convoy of an Interior Ministry official passed. The official was unharmed.
And the U.S. military says two Marines were killed in al-Anbar. A roadside bomb killed three U.S. soldiers there Saturday.
Meanwhile, the government announced it is postponing a planned reconciliation conference.
The National Dialogue ministry announced the postponement for reasons it said were "outside the control of the ministry."
The security situation in Baghdad has worsened since the start three weeks ago of the Muslim holy month of Ramadan, with officials reporting a spike in attacks across the capital.