Police sources told Reuters that at least 33 people were killed by a suicide bomber driving a car and gunmen disguised as police stormed a police headquarters in Kirkuk, northern Iraq.
Kirkuk, a religiously and ethnically mixed area of Arabs, Kurds and Turkman, is at the heart of a dispute over oil and land between Baghdad's central government and the autonomous Kurdistan enclave in the north.
The Sunday morning blast wounded at least 70 more people and police said there were still bodies trapped under the collapsed debris of buildings after the attack.
More top news
John Glenn, the first astronaut to successfully orbit the Earth, has died aged 95.
It'll become increasing cloudy tonight, with outbreaks of rain in the northwest
The Prime Minister opts for three colourful designs created by primary-age children in her constituency.