At least four people have been killed in a car bomb attack in the southwest of the Iraqi capital, Baghdad, security officials said.

The explosives-packed vehicle blew up in the south Baghdad neighbourhood of Saidiyah at around 7:00pm local time (1600 GMT) on Tuesday.

At least 15 other people were wounded in the blast, an interior ministry official, speaking on condition of anonymity, told the AFP news agency.

No one has claimed responsibility for the blast.

In another incident, gunmen attacked the headquarters of an anti-al-Qaeda militia in Diyala province at around 6:00pm local time (1500 GMT), killing two militiamen, a security official said.

Violence has declined nationwide since its peak in 2006 and 2007, but attacks remain common, particularly in the capital and in Diyala province.

On Sunday, 16 people were killed during a series of blasts in and around the capital. Many Iraqis worry that violence may increase when US troops withdraw in a pull-out scheduled for the end of this year.

Source: Agencies