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Law enforcement boats patrol the St. Johns River at the scene of a multiple shooting at the Jacksonville Landing Sunday, Aug. 26, 2018 in Jacksonville, Fla. A gunman opened fire Sunday during an online video game tournament that was being livestreamed from a Florida mall, killing multiple people and sending many others to hospitals, authorities said.   (Will Dickey/The Florida Times-Union via AP)

Law enforcement boats patrol the St. Johns River at the scene of a multiple shooting at the Jacksonville Landing Sunday, Aug. 26, 2018 in Jacksonville, Fla. A gunman opened fire Sunday during an online video game tournament that was being livestreamed from a Florida mall, killing multiple people and sending many others to hospitals, authorities said. (Will Dickey/The Florida Times-Union via AP)