Jacksonville police believe he stayed somewhere in the area Saturday night and he was at the tournament as a participant in the competition.
The sheriff's office said many people were transported to hospital, and its deputies found many others hiding in locked areas at The Landing. "We can't stress enough to stay away".
Few details were immediately available.
The GLHF Game Bar was hosting a qualifying tournament for the recently released Madden NFL 19 when the shooting started.
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A recording on the live stream platform Twitch shows two competitors playing the game before what looks like a red laser appears to point at one of the competitor's sweatshirts.
The Jacksonville Landing, in the heart of the city's downtown, also hosts concerts and other entertainment. "Please don't come running out".
His EA Sports player profile describes him as "consistently one of the best in competitive Madden" and he "remains one of the best around and can potentially win it all when it's done".
He added that two others were injured in the chaos as people sought to flee the gunfire.
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The family expressed sympathy for the Tibbetts family, and regret that one of their employees could be involved in such a crime. Richards argued for a gag order in the case and mentioned President Donald Trump , who he described as "sad and sorry Trump".
The shooting comes two days after a gunman killed one person and injured two at a high school football game, which Florida Sen. "We are working with authorities to gather facts at this stage, [but] this is a frightful situation, and our deepest sympathies go out to all involved".
"As I was coming out, I saw three bodies on the floor, unconscious", he said.
"It's very clear that we need to be more proactive for 2019 and beyond", tweeted Joey Cuellar, the tournament director for the Evolution Championship Series, an esports event that focuses on fighting games. "We can not accept this as our reality", said Delaney Tarr, one of the organizers of the student-led March for Our Lives movement. The gamers had gathered at a gaming bar in Jacksonville to play in the tournament and were broadcasting video of the game live through the internet.
Florida witnessed the second-deadliest public school shooting in United States history in February this year after a 19-year-old man went on a shooting spree killing 17 students and educators and injuring many.
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