JACKSONVILLE, Florida - Two people were killed and 11 others injured when a gunman opened fire at a popular waterfront mall in Jacksonville, Florida, where a video game tournament was being held. 

Michael Skimbo of Claremore is one of the top e-sport gamers in the country and was attending the "Madden NFL 19" tournament in Jacksonville where the shooting took place.

Skimbo notified his followers on social media that he was safe shortly after the shooting took place. He also tweeted his condolences for the two men who were killed.

There were 150 people involved in the two-day event, including players and spectators. Players were competing for a chance to play in the final round in Las Vegas. 

David Katz, 24, of Baltimore, Maryland, is believed to be the gunman, Jacksonville Sheriff Mike Williams said. Katz used a single handgun to carry out the shooting and died from a self-inflicted gunshot wound, he said. Williams described Katz as a white male who was attending the gaming event. He did not know if Katz knew the victims.