Police work near shattered windows from gunfire at the scene of a mass shooting at Old National Bank in downtown Louisville, Kentucky, US. Photo: Jeffrey Dean/Reuters Expand

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Police work near shattered windows from gunfire at the scene of a mass shooting at Old National Bank in downtown Louisville, Kentucky, US. Photo: Jeffrey Dean/Reuters

Police work near shattered windows from gunfire at the scene of a mass shooting at Old National Bank in downtown Louisville, Kentucky, US. Photo: Jeffrey Dean/Reuters

Police work near shattered windows from gunfire at the scene of a mass shooting at Old National Bank in downtown Louisville, Kentucky, US. Photo: Jeffrey Dean/Reuters

A gunman who carried out a mass shooting at a bank in Kentucky was a former star high-school athlete who had suffered a series of concussions.

Connor Sturgeon (23) killed five people and injured eight at the Old National Bank, in Louisville, on Monday.

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