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Law enforcement boats patrol the St. Johns River at The Jacksonville Landing after a mass shooting during a video game tournament at the riverfront mall, Sunday, Aug. 26, 2018, in Jacksonville, Fla. (Will Dickey/The Florida Times-Union via AP)

Law enforcement boats patrol the St. Johns River at The Jacksonville Landing after a mass shooting during a video game tournament at the riverfront mall, Sunday, Aug. 26, 2018, in Jacksonville, Fla. (Will Dickey/The Florida Times-Union via AP)