2004 Karbala and Najaf bombings
The 2004 Karbala and Najaf bombings were car bombings that tore through a funeral procession in Najaf and through the main bus station in nearby Karbala—two Shia holy cities – on 19 December 2004. 66 people were killed and 191 wounded.
Source: Wikipedia — 2004 Karbala and Najaf bombings (CC BY-SA 4.0)