BAGHDAD — A roadside bomb killed four people, including three army soldiers, and wounded 11 people south of Baghdad today, Iraqi officials said.

The blast took place near the municipal offices of the Rashid district just south of the Iraqi capital as soldiers were responding to an earlier explosion in the same area.

The first explosion, also caused by a roadside bomb, did not cause any casualties.

Police and hospital officials said the three soldiers and a bystander succumbed to their wounds in a Baghdad hospital. They spoke on condition of anonymity because they were not authorized to speak to the media.

Meanwhile, a police spokesman in Diyala province said the head of a five-member family killed Friday when a roadside bomb hit the car in which they were traveling was a local leader of a government-backed Sunni armed group known as an Awakening Council.