The sheriff's office said that one suspect was dead at the scene but it was unknown at this time if there was a second suspect.
Officials from the Jacksonville Sheriff's Office said there are "multiple fatalities" from a shooting that occurred at the Jacksonville Landing.
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Investigators have not said how Tibbetts was killed or what happened in the moments after she disappeared July 18 while jogging. Tibbetts was studying psychology at the University of Iowa and wanted to get a doctorate and write books, her father said.
A witness told Fox News that the shooter "was a gamer, for sure", and said there were "multiple guys who were upset" at being knocked out of the competition, a regional qualifying tournament for the national Madden NFL Championship.
Authorities say they are finding many people hiding in locked areas at The Landing. The area is not safe at this time. Sheriff Mike Williams said the scene has been secured and there are no outstanding suspects. They are searching the building now, and many people are in hiding.
Ryan Alemon said he was in the bar when at least one gunman began shooting.
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MF Aaron Ramsey , 6 - After being dropped for the match at Stamford Bridge, Ramsey was recalled to replace the sick Mesut Ozil . Although its a third defeat in a row, West Ham can count themselves unlucky to not come away from the Emirates with something.
The motive behind the shooting is not yet known.
"I just can't wrap my head around the fact we were here traveling just to play video games, something that we love to do, and it's just sad that lives were lost because of it", he said."Then we heard repeat shots and we took off running", said Mr Williams, who participated in the tournament earlier.
Katz was an avid gamer and has participated in various Madden tournaments in recent years. "I think the eSports industry as a whole is going to have to step back and take a look at further strengthening our security". JSO is urging people to stay put and call 911 so police can come and rescue them.
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Republican Senator Jeff Flake, who is chairman of the Senate Foreign Relations Committee Africa subcommittee, said. We have noted the tweet by President Trump and the allegations it makes against the South African government.
EA Sports, publisher of the Madden videogame, tweeted they were aware of the incident and said, "This is a disgusting situation, and our deepest sympathies go out to all involved". "We can not accept this as our reality", said Delaney Tarr, one of the organizers of the student-led March for Our Lives movement.