At least 12 people, including five foreign contractors, are killed in a car bombing in Baghdad. Over the past three days, a series of attacks have killed numerous Iraqis, including a senior civil servant and a top official in the foreign ministry. The attacks illustrate the security concerns Iraq's new government faces as it prepares to assume sovereignty June 30. Hear NPR's Steve Inskeep and Brig. Gen. Mark Kimmitt.