The deadliest attack came when gunmen stormed the house of a member of a Sunni militia opposed to al-Qaida, killing him and his wife and three children in a southern suburb of the capital, police and hospital officials said.
The militia, known as the Sahwa, helped US troops fight al-Qaida at the height of the war and since been a target for hard-line insurgents who consider them traitors.
Prominent Sahwa leader Wisam al-Hardan managed to escape unharmed an assassination attempt yesterday by two suicide bombers, but six of his bodyguards and a bystander were killed.
Gunmen shot two people dead in Baghdad's southern Dora neighbourhood and four bodies with gunshot wounds to the back were found in different locations around the Iraqi capital, the officials said.
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The discovery of the bodies was reminiscent of the sectarian violence that engulfed the country several years ago, when corpses were commonly dumped on the streets.
No one claimed responsibility for today's attacks in Baghdad, but they bore the hallmark of al-Qaida in Iraq and other Sunni insurgent groups.
In the southern city of Basra, gunmen shot and killed Sunni cleric Abdul-Karim Mustafa as he was walking near the al-Taqwa mosque, said police and other officials in the city.
Violence in Iraq has intensified since April to levels not seen since 2008. More than 4,000 people have been killed over the past five months alone, including more than 800 in August, according to figures provided by United Nations officials based in Iraq.