At least six people were killed and 31 wounded in bomb attacks in Iraq's eastern province of Diyala on Thursday morning, a provincial police source told Xinhua.

A booby-trapped car went off at the al-Mal'ab intersection in the north of the provincial capital city Baquba, some 65 km northeast of Baghdad, killing three people and wounding nine others. It also destroyed four nearby civilian cars, the source from the provincial operations command said on condition of anonymity.

In a separate incident, five home-made bombs ripped through a Kurdish residential area in the city of Jalawlaa, some 70 km northeast of Baquba, killing three people and wounding eight others, the source said.

The ethnically mixed city of Jalawlaa is part of the disputed areas claimed by both the semi-autonomous region of Kurdistan and the central government in Baghdad.

Another car bomb detonated near a security headquarters in the town of Baladruz, 30 km east of Baquba, wounding seven people, the source said.

Also in the province, four soldiers, one policeman and two civilians were wounded in three roadside bomb attacks across the province, the source added.

The attacks in the province came as a wave of similar bomb attacks in Baghdad and Salahudin province on Thursday morning's rush hours, which killed a total of 29 and wounded some 103 others.

Iraqi cities have been plagued by several attacks, including suicide bombings, since the U.S. troops pulled out of the country in December 2011.