A series of car bombs exploded across Baghdad during the past 24 hours, killing nearly 60 people.

It was not immediately clear who had carried out the attacks, which appeared coordinated, but Sunni Islamist militants, including an al-Qaeda affiliate, have been striking with a ferocity not seen in years.

The deadliest single blast took place in Baghdad's northern Talbiya neighbourhood, where a car bomb in a busy street killed nine people.

In the Hussainiya district on the northern outskirts of the capital, two car bombs exploded in quick succession, killing ten people.

About 800 Iraqis were killed in August, according to the United Nations, with more than a third of the deadly attacks happening in Baghdad.

Earlier on Tuesday, gunmen stormed the house of a Sunni, pro-government militia member in southern Baghdad and beheaded him, along with his wife and three children, police and medics said.

Separately, four unidentified bodies were found in different places in Baghdad.

All of the victims had been handcuffed, blindfolded and killed.