At least 28 are dead in an apparent booby trap aimed at Iraqi police officers.
Police responded on Wednesday morning to a tip that a wanted man was holed-up in a Baghdad home. An explosion was triggered when the officers entered the building. The ambush is the latest in a wave of attacks on Iraqi police and National Guard officers.
On Tuesday, a series of coordinated attacks on police stations in Sunni Muslim neighborhoods north of Baghdad left at least 30 dead.
In one attack alone, anti-coalition forces overwhelmed the police station in the town of Dijla and executed 12 officers. Casualties in other attacks included a police commander and the deputy governor of Anbar province.
One senior Iraqi National Guard officer escaped injury when a suicide bomber tried to kill him as he left home. At least eight guards and bystanders were injured in the assassination attempt.