Police say a suicide bomber has struck inside a restaurant near Kirkuk, killing at least 25 people and wounding dozens more.
Brig. Gen. Sarhad Qadir, commander of the Kirkuk police, also says about 45 people are wounded.
The explosion occurred Thursday at a restaurant about 2 miles north of Kirkuk, the center of Iraq's northern oil fields.
The reason for the attack was unclear but the city has been the scene of long-standing ethnic tension.
The Kurds want to annex Kirkuk and surrounding Tamim province into their self-ruled region in northern Iraq. Most Turkomen and Arabs want the province to remain under central government control, fearing the Kurds would discriminate against them.