Seven people were killed in a suicide bombing in West Baghdad on Sunday. The explosion, in which 28 others were wounded, took place in the Shi'ite-dominated Iskan district, after a suicide bomber detonated his belt of explosives, Reuters reported.

The Islamic State group claimed responsibility for the blast through its affiliated Amaq news agency. It said the attack targeted the Iran-backed Iraqi Shi'ite militia group known as the Badr Organisation.

The terror outfit, which still has control over sections of northern and western Iraq, has increased its offensive in state-controlled regions of the country in retaliation to losing territories to the United States-backed Iraqi forces and Iran-backed Shi'ite militias. The group also claimed responsibility for the 2003 bombing in Baghdad that killed at least 324 people.

The blast in West Baghdad comes a day after at least 12 security personnel died in Tikrit, north of Baghdad, in a triple suicide attack on Saturday. Officials said militants shot at a security checkpoint before driving a vehicle carrying explosives into it. Four security personnel died there. Two other militants drove into Tikrit city and detonated their car bombs, killing another eight people.