Iraqi security officials say a motorcycle rigged with explosives went off near a Shiite mosque south of the capital Baghdad, killing three people and wounding 34.
The officials said on Saturday that the blast occurred the previous evening on a commercial street in the village of Mussayyib. They spoke on condition of anonymity in line with regulations.
ISIS claimed responsibility for the attack, saying it targeted "gatherings of Shiites" near a Shiite mosque.
Iraq declared victory against ISIS in late 2017, but the group continues to carry out attacks through sleeper cells, particularly in the country's north.
Iraq's military announced it started a new operation early Saturday targeting ISIS hideouts and sleeper cells in the western Anbar province.
Iraq has been rocked by a series of mysterious explosions at militia arms depots and other facilities recently. The US said Israel had carried out air strikes against the bases. Previous fires at weapons facilities have been attributed to improper ammunition storage and summer heat.
