Another two car bombs went off in succession at a parking lot in Swayra town, some 70 km southeast of Baghdad, wounded three people and left some 30 cars burned, the source said.
A roadside bomb went off in Wasit's provincial capital of Kut, some 170 km southeast of Baghdad, wounding a civilian, the source added.
Elsewhere, three people were killed and 18 wounded in a roadside bomb explosion in an industrial area at the entrance of the holy Shiite city of Karbala, some 110 km south of Baghdad, a police source said.
In southern Iraq, two car bombs ripped through the city of Nasriyah, some 375 km south of Baghdad, wounding 11 people, police said.
Also in the south, a car bomb detonated in the oil-hub city of Basra, some 550 km south of Baghdad, killing three people and wounding 11 others.
In a separate incident, a civilian was killed and four wounded when a booby-trapped car went off near the convoy of Ryadh al-Adhadh, chairman of Baghdad Provincial Council, in the city's Adhamiyah district, an interior ministry source said.
Al-Adhadh escaped the blast unharmed and his convoy safely continued their way, the source said.
A civilian was killed and another wounded in a roadside bombing in Abu Ghraib area, about 25 km west of Baghdad, while another civilian was wounded when a bomb attached to his car exploded in Abu Dsheer district, in the southern part of the capital, the source added.
In northern Iraq, gunmen shot dead three passengers after they stopped their car on a main road in northern the city of Shirqat, some 280 km north of Baghdad, a local police source said on condition of anonymity.
No group has so far claimed responsibility for the attacks.
Iraq is witnessing its worst eruption of violence in recent years, which raises fears that the country is sliding back to the full-blown civil conflict that peaked in 2006 and 2007 when monthly death toll sometimes exceeded 3,000.
