Insurgent attacks kill 4 Iraqi security officers

Iraqi police and hospital officials say gunmen killed an off-duty traffic policeman in a drive-by shooting in eastern Baghdad, while insurgents killed an Iraqi army colonel in his car downtown.
Assailants killed two other policemen in separate incidents later Sunday, raising suspicion the killings were part of a coordinated campaign.
Insurgents in Iraq frequently target the country's security forces.
The officials spoke on condition of anonymity because they aren't authorized to brief the media.