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Bomb squad police prepare a robot to enter a parking garage a block away from the scene of a multiple shooting at the Jacksonville Landing Sunday, Aug. 26, 2018, during a video game competition in Jacksonville, Fla.

Law enforcement patrols the St. Johns River by boat just outside the Jacksonville Landing where 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.

Florida Highway patrolmen block the entrance to the Main Street Bridge near the scene of a mass shooting at Jacksonville Landing in Jacksonville, Fla., Sunday, Aug. 26, 2018.

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.

Police gather after an active shooter was reported at the Jacksonville Landing in Jacksonville, Fla., Sunday, Aug. 26, 2018.

Police investigate the scene of a multiple shooting Sunday, Aug. 26, 2018, at the Jacksonville Landing in Jacksonville, Fla., during a Madden Championship Series video game tournament.

A man on a bicycle is escorted away by police officers after he wandered into a crime scene near a mass shooting at Jacksonville Landing in Jacksonville, Fla., Sunday, Aug. 26, 2018. Florida authorities are reporting multiple fatalities at the riverfront mall that was hosting a video game tournament.

State Attorney Melissa Nelson, left, arrives to the scene of a multiple shooting at the Jacksonville Landing Sunday, Aug. 26, 2018, during a video game competition in Jacksonville, Fla.

A police officer directs a pedestrian away from a blocked off area near the scene of a mass shooting at Jacksonville Landing in Jacksonville, Fla., Sunday, Aug. 26, 2018.

Jacksonville Sheriff Mike Williams, right, holds a news conference, Sunday, Aug. 26, 2018, in Jacksonville, Fla., after a gunman opened fire Sunday during an online video game tournament.