The man suspected of shooting two people to death and wounding 11 others at a Madden 19 video game tournament at The Landing in downtown Jacksonville is a Baltimore, Md. resident.

He was identified by the Jacksonville Sheriff's Office as 24-year-old David Katz.

Jacksonville Sheriff Mike Williams said Katz was a lone shooter with a handgun who opened fire on tournament participants inside the Chicago Pizza restaurant at just after 1:30 p.m. Sunday.

Katz was found dead at the scene from a self-inflicted gunshot, according to the sheriff's office.

Jacksonville police believe he stayed somewhere in the area Saturday night and he was at the tournament as a participant in the competition. They did not have any information on his motive. Police also said local authorities were responding in Baltimore to the suspect's residence for further investigation.

Six victims between the ages of 20 and 35 were at UF Health late Sunday. One victim was in serious condition and the other five were in good condition.

The victims in the shooting have not yet been identified, but one of them, Drini Gjoka, 19, of DC, took to Twitter saying he was lucky that a bullet only grazed his thumb.

A live feed from the tournament was underway when the shooting took place, and the audio feed was interrupted by the sound of several gunshots.

White House press secretary Sarah Sanders said President Donald Trump had been briefed and was monitoring the situation. Gov. Rick Scott said he had promised Mayor Lenny Curry and other officials in Jacksonville any state support they might need.

Sen. Bill Nelson issued a statement after Sunday's shooting saying "Word of another tragic mass shooting in our state brings shock and outrage."

WATCH: Witness: 'I'm not going to blame guns for this'

Ryan Alemon said he was in the bar when at least one gunman began shooting.

"Everyone was running, they were dropping because they were getting shot," Alemon told CNN. "I heard yelling, I heard 'Help me, I'm shot.'"

Alemon said he hid in bathroom for about 10 minutes before fleeing the bar when he was certain the shooting was over.

The Jacksonville Landing is an entertainment complex along the St. Johns River. The area includes waterfront restaurants and an indoor shopping mall. The gaming bar bills itself online as "Jacksonville's home for gamers and nerds alike."

Three dead, 11 injured in mass shooting at Madden video game tournament at Jacksonville Landing

WATCH: Witnesses recount chaos during Jacksonville Landing mass shooting at Madden tournament

WATCH: Witnesses recount chaos during Jacksonville Landing mass shooting at Madden tournament