At least three people were killed and 20 others injured when a car bomb exploded in a market in Tall Afar area west of Mosul, some 400 km north of the Iraqi capital of Baghdad, a local police source told Xinhua on condition of anonymity.
One civilian was killed and eight others were wounded when a roadside bomb went off near a bakery in a market in Kamalya area in eastern Baghdad, the source said.
Earlier in the day, seven people were killed in three separate violent attacks in central and eastern Iraq, according to other police sources.
On Monday morning, gunmen using silenced weapons shot dead a man and his son, and separately gunned down another man in Baghdad 's southeastern suburb of Jaarah, a Baghdad police source anonymously told Xinhua.
In Iraq's eastern province of Diyala, gunmen in a car shot dead a government-backed Sahwa paramilitary group member and his relative in the city of Maqdadiyah, about 40 km northeast of the provincial capital city of Baquba, a provincial police source said.
The Sahwa militia, also known as the Awakening Council or the Sons of Iraq, consists of armed groups, including some powerful anti-U.S. Sunni insurgent groups, who turned their rifles against the al-Qaida network after the latter exercised indiscriminate killings against both Shiite and Sunni Muslim communities.
In a separate incident, two civilians were killed when gunmen opened fire on their car in the town of Abu Saiyda, some 30 km east of Baquba, the source said.
Iraq has been witnessing its worst eruption of violence in five years, which raised fears that the country is sliding back to a full-blown civil conflict that peaked in 2006 and 2007, when monthly death toll sometimes exceeded 3,000.