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A white US police officer has shot and killed a 13-year-old black boy in the state of Ohio while chasing down suspects of a reported robbery, after the teenager allegedly pulled out a pellet gun.

Police in the town of Columbus, where the incident took place, said they were investigating Wednesday's killing of Tyre King, the latest in a string of shootings of African Americans by law enforcement officers that have fuelled protests and national debate about policing tactics in US cities.