Police officials in the Iraqi capital, Baghdad, say a suicide car bomber has attacked a police checkpoint, killing seven people, including civilians.

Police say the car exploded at a checkpoint at the northern entrance to the Kazimiyah section of Baghdad, killing three police officers and four civilians. They say another 16 people were wounded in the attack.

Hospital officials corroborated the casualty figures. All spoke on condition of anonymity as they are not authorized to brief journalists.

No one immediately claimed responsibility for this attack. However, the Islamic State militant group is often behind attacks on checkpoints as it seeks to challenge Iraqi security forces amid intensifying battles in northern and western Iraq.