The twin attack took place in the town of Tuz Khormato, about 200 kilometres (130 miles) north of Baghdad, when a suicide bomber drove his explosive-laden truck into a checkpoint leading up to the offices of the Patriotic Union of Kurdistan and the nearby Kurdistan Communist Party.
Mayor Shalal Abdoul said another truck bomb exploded, presumably detonated by remote control, as people rushed to the scene of the first attack. The blasts killed 21 people and wounded as many as 150, he said. Several houses and cars were destroyed in the attack.
Also today, gunmen opened fire on a security checkpoint northeast of Baghdad, killing four soldiers and two police officers, police said. The shooting happened in the town of Kanaan, about 75 kilometres (47 miles) northeast of the capital.
And in Baghdad, gunmen killed a real estate agent after spraying his office with bullets in the city's west, police said. A bomb blast also killed a government employee in eastern Baghdad, police said.
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Police said a bomb on a boat destroyed a bridge on the Euphrates River linking a road between the city of Fallujah and southeastern Baghdad. No casualties were reported.
Meanwhile, the head of Anbar's provincial council, Sabah al-Karhout, told reporters in Ramadi that gunmen still held 15 staff members from Anbar University in a campus building after militants stormed it days earlier.
Last week, gunmen attacked the university near Ramadi city, detaining dozens of students inside a dorm. At that time, Karhout said hundreds of students were there.
Karhout said today that university authorities said about 15 staffers are still missing, likely held by a group of gunmen in a university building. More than USD 10 million were looted from the university safe, he said.
It wasn't clear how security forces missed a group of gunmen after sweeping the campus.