Clashes have been reported between Iraqi and Kurdish forces in the city of Kirkuk and around the nearby oil fields.
A car bomb has killed at least 64 people and wounded dozens more at a crowded market in northern Baghdad.
Iraq is facing political turmoil after security forces loyal to Nouri Maliki took up strategic positions around Baghdad after he criticised President Fuad Masum in a press conferences and demanded to be appointed as prime minister for a third term.
12 bombs have exploded across the Iraqi capital of Baghdad over the last two days, killing at least 82 people and leaving scores more injured.