"We can't stress enough to stay away".
Officials with UF Health Jacksonville, the top trauma hospital in the area, said they treated six victims ranging in age from 20-35, with one victim in serious condition.
Jacksonville Sheriff Mike Williams said Katz was a lone shooter with a handgun who opened fire on tournament participants inside the Chicago Pizza restaurant.
Local media identified the dead victims as Eli Clayton, 22, of Woodland Hills, California, and Taylor Robertson, 27, of Ballard, West Virginia. Police urged anyone hiding inside the building to remain calm and wait for police to reach them.
The Jacksonville Sheriff's Office has been sharing updates on its Twitter feed.
"We hit the floor; I was pushed, trampled and stuff, and I had to get over [people] to get out", Poindexter said. Swat is doing a methodical search inside the Landing. "Please don't come running out".
Investigators were looking into an online video that appeared to capture the scene right before the shooting began, Williams said.
White House spokeswoman Sarah Sanders said President Donald Trump had been briefed and was monitoring the situation.
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According to a news update that evening, he said the gunman, who reportedly killed himself after shooting multiple individuals, had been identified pending final confirmation from the Federal Bureau of Investigation.
Malik Brunson said he was at a nearby Hooters restaurant when the shooting occurred.
Another player, "DubDotDUBBY", said a bullet had grazed his head.
Williams said law enforcement received 911 calls shortly after 1:30 p.m., local time, about shots fired at the location, and that authorities responded within minutes.
"I'm still shocked, I can hardly talk", he told CNN.
The shooter was a gamer who had lost, competitor Steven "Steveyj" Javaruski told the Los Angeles Times. Electronic Arts, the company that produces the video game, tweeted that it was "aware of an incident" at the tournament.
Police added that the public should stay away from the area and that there were "multiple fatalities at the scene".
"The tourney just got shot up. We can not accept this as our reality", said Delaney Tarr, one of the organizers of the student-led March for Our Lives movement. "I think the eSports industry as a whole is going to have to step back and take a look at further strengthening our security". A second person with gunshot wounds followed shortly behind them. The Jacksonville Landing is located on the downtown waterfront, near Independent Drive and S. Main Street.