The officials said the blast happened the previous evening on a commercial street in the village of Mussayyib. They spoke on condition of anonymity in line with regulations.
The Islamic State group claimed responsibility for the attack, saying it targeted “gatherings of Shiites” near a Shiite mosque.
Iraq declared victory against IS in late 2017, but the group continues to carry out attacks through sleeper cells, particularly in the country’s north.
WATCH: Explosion reported at Iraqi state militia base in Baghdad (Aug. 12)
Iraq’s military announced it started a new operation early Saturday targeting IS hideouts and sleeper cells in western Anbar province.
The military said the operation aims to “search and clear” wide desert areas in the province that borders Saudi Arabia, Jordan and Syria.