GLHF Game Bar/Facebook

Three people died and another 11 were injured after a gunman opened fire at a video game tournament Sunday in Jacksonville, Florida, law enforcement officials say.

The suspected shooter, believed to be 24-year-old David Katz of Baltimore, was among the dead, Jacksonville Sheriff Mike Williams said during a news conference, adding that authorities didn't believe there were any additional suspects. Williams declined to discuss a possible motive, but the Los Angeles Times reported the shooter was a gamer who was competing in the tournament and lost.

The identities of the victims weren't disclosed.

The shooting occurred around 1:34 p.m. ET at the Jacksonville Landing marketplace in downtown Jacksonville during the Madden 19 Tournament at the GLHF Game Bar inside the Chicago Pizza restaurant. At least a dozen shots could be heard fired on a livestream originating from the event.

The tournament was the first of four planned qualifier events before the Madden finals in Las Vegas in October. EA Sports, publisher of the Madden game franchise and organizer of the events, didn't immediately respond to a request for comment on what its plans were for the remaining three events, the first of which is scheduled for next weekend in Dulles, Virginia.

CompLexity Gaming, a professional gaming team, had a player at the event. One Madden player, Young Drini, was grazed in the hand and is away from the scene and safe, Complexity reported.

An update from the Jacksonville Madden event:



There appears to have been a shooting at the event, and @YoungDrini was grazed in the hand. He is away from the scene and safe. — compLexity Gaming (@compLexity) August 26, 2018

Drini tweeted about being thankful for his life after the shooting. "I will never take anything for granted ever again," he wrote.

I will never take anything for granted ever again. Life can be cut short in a second — Drini Gjoka (@YoungDrini) August 26, 2018

EA Sports issued a statement on Twitter expressing its condolences.

"This is a horrible situation, and our deepest sympathies go out to all involved," EA Sports said.

This is a horrible situation, and our deepest sympathies go out to all involved. — EA SPORTS Madden NFL (@EAMaddenNFL) August 26, 2018

First published Aug. 27, 11:49 a.m. PT.

Update, 1:35 p.m. PT: Adds information about casualties.

Update, 4:40 p.m. PT: Adds further information about casualties.

Cambridge Analytica: Everything you need to know about Facebook's data mining scandal.

iHate: CNET looks at how intolerance is taking over the internet.