A suicide bomber attacked a military checkpoint south of Baghdad on Tuesday, killing at least three National Guards, a police source told Xinhua.

"Three National Guards were killed in the attack in the town of Mahmoudiya, some 30 km south of Baghdad," the source said, adding that seven people, including four National Guards and three civilians were injured.

Insurgents frequently target the fledgling Iraqi security forces, accusing them of collaborating with the US occupation forces.

Source: Xinhua