TOPSHOT - An ambulance transports injured victims beside a burning bus at the site of an explosion in Karachi on December 29, 2012. At least four people were killed and dozen wounded when a loud explosion ripped apart a passenger bus outside the railway station in the Pakistani port city of Karachi, the nature of the explosion could not be ascertained. AFP PHOTO/Asif HASSAN (Photo by ASIF HASSAN / AFP) (Photo by ASIF HASSAN/AFP via Getty Images)
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AFP ASIF HASSAN