Gunmen have killed Baghdad's deputy police chief outside his home.
Brigadier Amer Nayef and his son were shot dead as they left the family home in the southern Dora area of the capital this morning, the source said.
Elsewhere, a suicide bomber in a patrol car killed three Iraqis at a police station, a police source said. The powerful blast in the southern Zaafaraniya area also wounded police officers.
Three weeks before Iraqis go to the polls, insurgents have stepped up their campaign of violence to derail the country's first election since the US-led invasion that overthrew Saddam Hussein.
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Iraq's fledgling security forces have borne the brunt of attacks by insurgents who accuse them of collaborating with US-led forces in the country.