A double car bombing killed at least 10 people and wounded 60 in a crowded market in the northern Iraqi city of Kirkuk on Saturday, police sources said.
The explosions occurred in Kirkuk's Rahim Awa district, a predominantly Kurdish area of the ethnically mixed city. Several cars and shops were burnt out.
Hospital officials said the condition of many of the wounded was considered life-threatening.
Iraqi officials fear violence may increase outside the capital Baghdad as US and Iraqi forces step up a crackdown on insurgents and militias in the city.
Some officials say militants are avoiding confrontation in Baghdad or may have left the city.