Health and police officials said several explosions in the village of Khazna, about 12 miles northeast of Mosul, killed at least seven people and wounded 11 others, CNN reported.
In Tuz Khurmato, near Kirkuk, authorities said two car bombs killed at least five people and wounded 25 others. Police said one explosion was outside a hospital and the other occurred outside a Shiite mosque.
China's Xinhua News Agency reported an ethnic Shiite minority named al-Shabak was the target of another car bomb, which ripped through their village of Tahir-Awa, east of Mosul. Seven people were killed in that attack.
The explosions Monday came during a time of high tensions between the Kurdistan Regional Government and the central government of Iraq over the disputed oil-rich city of Kirkuk.
In another area under dispute, a car bomb Sunday targeted the Patriotic Union of Kurdistan in Baquba, the capital of Diyala province, killing eight people and injuring at least 24 others, officials said.