A suicide car bomb attack on a checkpoint in Baghdad killed at least 15 people Tuesday, the third deadly bombing to hit the Shiite neighbourhood of Kadhimiyah in four days, medical sources said.

Several policemen were among the dead and the blast also left at least 23 people wounded, a health ministry official and a hospital source said.

According to Iraqi officials, the Shiite lawmaker Ahmed al-Khafaji was among the people killed in the bombing.

On Monday, at least 43 people were killed in three attacks in Baghdad, including one on the edge of Kadhimiyah, which was claimed by the Islamic State group.

The jihadist organisation also claimed responsibility for another of the three attacks, saying one of its Saudi followers detonated a suicide car bomb packed with 650 kilogrammes of explosives in the Sadr City neighbourhood.

Kadhimiyah was already one of two areas targeted in double bombings that left more than 40 dead on Saturday.

The United Nations said more than 1,110 people were killed in acts of violence across Iraq in September. According to an AFP count, more than 350 have already been killed this month.

While the bloodshed has been mainly on the frontlines where federal, Kurdish and allied forces are battling the Islamic State group , blasts and executions in Baghdad continue to take a heavy toll.

While most of the major suicide bombings in Baghdad are ascribed to IS, some of the smaller bomb attacks and assassinations are carried out by other more marginal Sunni groups and by Shiite militias.