Six people were killed and 25 wounded in separate attacks mainly targeted Iraqi traffic police in Baghdad on Monday, the police said. Gunmen blew up bombs in the house of a policeman in Abu Ghraib area, some 20 km west of Baghdad, killing his wife and wounding him and two of his children, a local police source told Xinhua on condition of anonymity. In Baghdad, a roadside bomb struck a traffic police vehicle in al-Mudafer Square in the eastern neighborhood of Sadr City, wounding five policemen, an Interior Ministry source anonymously told Xinhua. In a separate incident, four traffic policemen were injured when a roadside bomb went off near their patrol in Beirut Square in eastern the capital, the source said. Also in the capital, a mortar round landed on the police academy in eastern Baghdad, wounding two students, the source added. Earlier in the day, the police reported the killing of five people, including two traffic policemen, and the wounding of 12 people in separate gunfire and bomb attacks, including a suicide one, in Baghdad. Violence is still common in the Iraqi cities despite the dramatic decrease since its peak in 2006 and 2007 when the country was engulfed in sectarian killings.