A wave of coordinated car-bomb attacks throughout Iraq on early Wednesday killed 63 people and injured dozens more—one of the deadliest attacks since U.S. troops withdrew from the country last year. The first bomb struck a procession at around 5 a.m. in the town of Taji, north of Baghdad, killing seven and wounding two. That was followed by coordinated blasts in Baghdad, Hillah, Karbala, and Balad. Another person was killed in Kirkuk when three more bombs exploded, one outside a prominent political office. The wave of violence this week comes as hundreds of thousands of Shiites participate in the annual holy pilgrimage to Baghdad.