Car bombs rocked Iraq's two holiest Shiite cities today, killing at least 60 people and wounding more than 120. In downtown Baghdad dozens of gunmen carried out a brazen ambush on car, killing three employees of the organization running next month's elections. The bombings came just over an hour apart. First a suicide blast that ripped through minibuses at the entrance of the main bus station in the city of Karbala. Then a car bomb in a central square of Najaf crowded with people watching a funeral procession attended by the city police chief and provincial governor.