Two people were killed and 11 others injured when a gunman opened fire yesterday at a popular waterfront mall in Jacksonville, Florida, where a video game tournament was being held. Graphic recordings from the scene captured gunshots ringing out and the screams of terrified patrons taking cover.

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.

Nine others were wounded by gunfire and two others were injured as they fled the shooting, Williams said. They are all in stable condition.

The tournament for “Madden NFL 19” players was being held at the GLHF Game Bar, which shares space with a restaurant. The bar said all staff members and the owner were able to escape “untouched.”

Gunshots can be heard in recordings from the tournament on the bar’s Twitch account, which was streaming the competition. Williams said investigators were reviewing the footage as evidence and encouraged the public to turn in any additional videos that could help with the investigation.

Williams said the FBI is assisting with the investigation in Baltimore. Investigators believe Katz may have stayed in a hotel during the event. Williams said authorities have impounded Katz’s vehicle and plan to search it for evidence.

Late Sunday night, the FBI said heavily armed agents had entered the family home of the suspect. Dave Fitz said agents went to the upscale townhouse home of the man’s father in Baltimore, but didn’t release any further information, citing the ongoing investigation.

Agents could be seen inside the home near Baltimore’s Inner Harbor wearing bulletproof vests and carrying long guns. Reporters at the scene did not see any authorities carrying any bags of evidence outside.

Drini Gjoka, who was competing in the event, tweeted about the shooting in the immediate aftermath. “The tourney just got shot up. Im leaving and never coming back,” he wrote at 1:37 p.m. Four minutes later, he added that a bullet struck him in the thumb, and later called yesterday the “worst day of my life.”

“I will never take anything for granted ever again. Life can be cut short in a second,” he said.

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.

Florida Governor Rick Scott, who was traveling to Jacksonville, tweeted that he offered state resources to the local law enforcement. His office said the Florida Department of Law Enforcement and Florida Highway Patrol were assisting in the investigation.

EA Sports said it was aware of the shooting and is working with authorities to gather information. “This is a horrible situation, and our deepest sympathies go out to all involved,” the company said. “Our focus right now is on those affected, and supporting law enforcement as they continue their investigation into this crime.”