A damaged vehicle lies on a road after a bomb attack in Baghdad yesterday. At least six people were killed and 20 wounded when two bombs went off in succession in a busy street in central Baghdad yesterday, police said. Ten policemen were amongst the wounded in the attack. --Xinhua/Reuters

Six Iraqis were killed and 20 others injured when two roadside bombs exploded coordinately outside a police headquarters in central Baghdad yesterday, an Interior Ministry source said.

The incident occurred in the morning when the bombs exploded in a quick succession near the headquarters in the Tahariyat Square in Karrada district," the source told Xinhua on condition of anonymity.

Ten policemen were among those wounded, the source said.

The blasts also damaged several nearby shops and civilian cars, the source added.

Iraqi security forces cordoned off the area to secure the scene while ambulances evacuated the wounded to nearby hospitals, he added.

Violence has dropped to a four-year low in Iraq, while sporadic roadside bombs, car bombings and suicide attacks are still haunting the Iraqis.