Multiple people were killed in the shooting at the Jacksonville Landing shopping and dining complex in downtown Jacksonville, Florida, the Jacksonville Sheriff's Office said Sunday afternoon. The shooting took place at a qualifying event for the Madden 19 tournament .
Four people have died, including the gunman. In total, there were 13 shooting victims, authorities said in an evening news conference.
The man authorities say was the shooter is 24-year-old David Katz, of Baltimore, Maryland. Katz, also known as "Bread", had previously played in and won a Madden tournament in Buffalo that took place at 716 Food and Sport. The event was held in 2017.
Below you can see a tweet from the Buffalo Bills congratulating Katz on his win, as well as an explanation of the tournament from the Madden official website .