A car bomb exploded near a power station in southern Baghdad on Friday, killing at least six policemen, police source said.
The blast took place at a police checkpoint outside the Doura power station in southern Baghdad, when a suicide bomber tried to ram his explosive-laden vehicle to the power station, killing at least six policemen and wounding four others, including two civilians, the police said.
Insurgents have been mounting attacks in a bid to derail Sunday's national elections.