Iraqi police and health officials say two roadside bombs have killed four anti-al-Qaida Sunni militiamen north of Baghdad. A police officer said Sunday the first bomb went off next to a passing patrol of the pro-government fighters, known as Sahwa or Awakening Councils. He said the second bomb hit another patrol rushing to the scene few minutes later, killing two others. Three Sunni fighters were injured. The attack took place near the town of Mishahda, 20 miles (30 kilometers) north of Baghdad. A doctor in a nearby hospital confirmed the casualty figures. Both officials spoke on condition of anonymity as they were not authorized to release information.