David Katz, 24, (above at last year's tournament) killed himself and two others, and left 11 people injured

Police have identified the mass shooter who terrorized a video game tournament in a shooting spree that was partially captured on a horrifying livestream.

David Katz, 24, killed himself and two others, and left 11 people injured in the shooting at the Jacksonville Landing complex in Jacksonville, Florida at around 1.34pm on Sunday, police said.

According to friends in the gaming community, the two men whom Katz killed in the tournament were Taylor 'SpotMePlzzz' Robertson, 27, of Ballard, West Virginia and Eli 'Trueboy' Clayton, 22, of Woodland Hills, California.

Robertson was married and father to a young son, and had won 13 out of his 18 prior matches in Madden NFL tournaments, according to EA Sports. Clayton was a rising star in the Madden community.

Police have not yet confirmed the identities of the deceased victims. Local media, including the Miami Herald and ActionNewsJax, have named Robertson and Clayton as the deceased victims, after members of the Madden gaming community posted numerous online tributes.

An official close to the investigation said that the gunman killed himself with the semi-auto handgun used in the shooting, which had a laser sight.

A livestream of the tournament caught the chilling moment that a laser landed on Clayton's chest before shots rang out.

A red dot (circled) that appeared to be from a laser pointer was seen on Clayton's chest in a livestream, shortly before the camera cut away, and gunshots and screams were heard

Members of the Madden community say that Eli Clayton (left) and Taylor Robertson (right with wife and son) were the two people killed in Katz's suicidal shooting rampage

Eli 'Trueboy' Clayton, 22, of Woodland Hills, California was also killed in the shooting, friends said. He is seen above in a previous Madden tournament

Police are seen at the scene of the shooting in Jacksonville after night fell on Sunday

Nine of the non-fatal injuries were gunshot wounds and two were sustained while fleeing the chaos, Jacksonville Sheriff Mike Williams said.

Jacksonville Madden NFL shooting timeline Saturday, August 25: David Katz, from Baltimore, arrives at the Madden 19 regional tournament in Jacksonville. Sunday, August 26: Katz returns for the second day of the tournament wearing the same clothes as Saturday, and acting 'weird', a witness says. He is eliminated and returns with a gun. 1.34pm, August 26: The first 911 calls come in reporting gunshots in Jacksonville Landing. 1.36pm: The first officers arrive on the scene. They find three dead, including Katz, who is identified as the shooter. 4.30pm: SWAT teams finish clearing the shopping center. 7.30pm: Federal agents stage to raid Katz's family home in Baltimore. Advertisement

Florida Governor Rick Scott visited several of the injured on Sunday night, including Timothy 'OLarry2k' Anselimo, who was expected to recover after being shot in the chest and hand.

Williams said that Katz was from Baltimore and had traveled to Jacksonville for the Madden 19 video game tournament. His car was seized by police near the scene.

About 150 gamers competed in the competition for a $5,000 prize. The winner was set to go on to a finals tournament in Las Vegas with a $125,000 prize.

One of the gamers to defeat Katz in the tournament told ActionNewsJax that Katz was acting 'weird' on Sunday and wearing the same clothes he wore the day prior, on the first day of the tournament.

The gamer said that when he beat Katz on Saturday in the group round, he tried to shake his hand, but that Katz just stared back at him blankly.

Florida Governor Rick Scott (center) is seen visiting one of the wounded victims, Timothy Anselimo aka OLarry2k, in the hospital on Sunday as he recovers from being shot

Anselimo's mother posted this photo from the hospital showing his bloodied backpack

Another injured victim, who plays under the name Fitzmagic, posted this update on Twitter

Another witness to the shooting, Javarius Long, told the Tampa Bay Times that the shooter was acting 'nerdy'.

Long said that Katz got mad after losing in the elimination round on Sunday, left the venue presumably to retrieve the gun from his car, and came back and started 'blasting everybody'.

Katz is known to have gone by the gamer monikers 'RavensChamp', 'Bread' and 'TREXHAVAHARTATAK'.

In February 2017, he won the Madden 17 Bills Club Championship in Buffalo, New York.

An announcer for one of the gaming tournaments Katz previously played in described him thus: 'He is not here to make friends. He's all business, he's focused, and to even get him to open up to talk to you about anything - it's like pulling teeth, man.'

After defeating the number two seed 41-7 in the Bills Madden Club Round, Katz told a reporter: 'I don't think of myself as a 7th seed.

'I think personally, I'm one of the better players – and I like to let my game prove that.'

He added: 'I understand the game really well. My opponent probably should've called his timeouts… I took advantage that he didn't.'

According to the New York Post, he won $10,000 at the Buffalo Bills Madden Club tournament, but lost in the quarter-finals in California.

When asked if he was nervous during the game in Buffalo, he added: 'Honestly, I felt like I had the ball most of the game. I wasn't really doing too much on defense.'

As a child, Katz had 'significant healthcare needs', according to court records in his parents' divorce.

At the time of the 2014 court filing, the shooter's father worked for NASA, and his mother, who has a PhD in toxicology, worked for the US Food and Drug Administration.

Katz (right) is seen in February 2017 at the Madden 17 Bills Championship, which he won. Police said he is from Baltimore and was in Jacksonville for Madden 19

Katz (above) is known to have gone by the gamer monikers 'Bread' and RavensChamp'

An announcer once said of Katz (above): 'To even get him to open up to talk to you about anything - it's like pulling teeth'

On Sunday night, FBI and ATF agents raided a home in the upscale Federal Hill neighborhood of South Baltimore.

It is believed to be the home of Katz's father, where the shooter himself also lived.

The agents could be seen inside the home Sunday evening near Baltimore's Inner Harbor. They wore bulletproof vests and carried long guns. Reporters who gathered outside did not see any authorities carrying any bags of evidence outside.

A neighbor, Jerry Knauer, described Katz's father as a 'really good guy' adding in a video interview that 'he's been really nice to us'.

Another neighbor told DailyMail.com that Katz had been about 17 when the family moved into the neighborhood about six years ago.

'Nothing suspicious, they just seemed like a kind of quiet, normal family,' the neighbor said.

A neighbor, Jerry Knauer (above), described Katz's father as a 'really good guy' adding in a video interview that 'he's been really nice to us'

Federal authorities stage and search a home in Baltimore's Inner Harbor as part of an investigation into the Jacksonville mass shooting. An FBI official in Baltimore confirmed that its agents were searching the family home of the man authorities believe was behind the attack

ATF agents stand outside the Katz home in Baltimore hours after the Jacksonville shooting

The Katz family home (left door) was raided by federal agents just hours after the shooting

ATF agents leave the Katz family home in Baltimore on Sunday hours after the shooting

Baltimore City police and ATF agents went in and out of the home of Jacksonville shooter David Katz on Sunday night

On Sunday night, FBI and AFT agents raided this Baltimore residence in connection with the shooting. Katz lived in a gated community in Federal Hill, an upscale part of South Baltimore

The shooting on Sunday broke out during the Madden NFL 19 Classic regional qualifying tournament at the Good Luck Have Fun video game room.

The video game venue is attached to Chicago Pizza, a restaurant inside the Jacksonville Landing shopping complex that sits on the north bank of the St John's River.

In a livestream of the tournament, one of the players is seen with a dot that appears to be a laser pointer dancing on his chest and neck.

As the live video shot cuts to the action on the virtual football field, gunshots and chilling screams can be heard in the background.

The commentators can be heard going silent as the first gunshots are fired and people begin screaming.

The stream then cuts off and a message appears saying 'controller disconnected'.

WARNING: GRAPHIC AUDIO

Players are seen in the tournament moments before gunshots and screams are heard, with the live video cutting out abruptly and displaying the message 'controller disconnected'

A livestream from the gaming tournament captured the moment the gunfire broke out before it cut out and displayed a 'controller disconnected' message

The shooting broke out during the Madden football online gaming tournament at Florida 's Jacksonville Landing (above) on Sunday afternoon

Police investigate the scene of a multiple shooting at the Jacksonville Landing on Sunday

Taylor Poindexter speaks to reporters after witnessing a gunman open fire on a video game tournament. She sprained her ankle while fleeing from the gunfire with her boyfriend

One witness told CNN he saw the gunman shoot multiple people before killing himself and that it appeared he had a laser sight on the gun to help him target victims.

Police arrived on the scene within two minutes of receiving the first 911 calls at 1.34pm, Sheriff Williams said.

Witnesses said people trampled each other while fleeing the gunfire.

Marquis Williams, 20, says he and his girlfriend, Taylor Poindexter, both from Chicago, were ordering pizza close by when shots erupted. He said Sunday that he didn't think it was gunfire at first.

Says Williams: 'Initially we thought it was a balloon popping, but there weren't any balloons in the room. Then we heard repeat shots and we took off running.'

Law enforcement boats patrol the St. Johns River at the scene of a multiple shooting at the Jacksonville Landing Sunday on Sunday

A police officer directs a pedestrian away from a blocked-off area near the scene of a mass shooting at Jacksonville Landing on Sunday

A Florida Highway patrolman stands by his car blocking the entrance to a street near the scene of a mass shooting at Jacksonville Landing on Sunday

Florida Highway patrolmen block the entrance to the Main Street Bridge near the scene of a mass shooting at Jacksonville Landing on Sunday

Williams had participated earlier Sunday in the Madden gaming tournament. He says he got a view of the back of the shooter in a green shirt.

He describes people running in the panic to escape. He says it was then that he scuffed his leg and that Poindexter was treated at a hospital for a sprained ankle.

They later returned, hoping to retrieve her cell phone, but by then the scene was cordoned off by authorities.

One of the gamers in the tournament, Drini Gjoka, revealed his horror after he was shot in the hand and ran for his life.

'The tourney just got shot up. I'm leaving and never coming back. I am literally so lucky. The bullet hit my thumb. Worst day of my life,' he tweeted.

'I will never take anything for granted ever again. Life can be cut short in a second.'

Police gather after an active shooter was reported at the Jacksonville Landing on Sunday

A police officer stands by where an active shooter was reported Sunday in Jacksonville

Law enforcement patrols the St. Johns River by boat just outside the Jacksonville Landing where an active shooter was reported on Sunday

One gamer, Timothy Anselimo, was shot three times in his chest and hand. His mother tweeted: 'My son was shot 3 times please keep him in your prayers'.

'@oLARRY2K was shot in chest and hand I was with him. I have his bag and phone. Plz retweet this to notify 2k community. He is at Florida Shands hospital. didn't look life threatening to me but injured bad. I love you bro,' fellow gamer BUCTILLIDIE tweeted.

Another witness, Ryan Alemon, told CNN he hid in the bathroom for about 10 minutes before fleeing the bar when he was certain the shooting was over.

'Everyone was running, they were dropping because they were getting shot. I heard yelling, I heard 'Help me, I'm shot',' he said.

'As I was going in the restroom, I stayed in there, and I just heard - there was just so many gunshots, at least 20 of them at the most.'

For several hours after the shooting, officers worked finding people hiding in the area and urged people to remain calm, as they warned others to stay far away from the Jacksonville Landing.

Jacksonville Sheriff Mike Williams, right, holds a news conference on Sunday after a gunman opened fire during an online video game tournament in a Florida mall

Police barricade a street near Jacksonville Landing after the mass shooting broke out

Many hid in bathrooms of the Jacksonville Landing complex, trying to escape the carnage.

'We are finding many people hiding in locked areas at The Landing,' the Jacksonville Sheriff's Office tweeted.

'We ask you to stay calm, stay where you are hiding. SWAT is doing a methodical search inside The Landing.

'We will get to you. Please don't come running out.'

By about 4.30pm, SWAT teams had cleared the Jacksonville Landing of potential victims and witnesses.

Multiple emergency crews were spotted on the scene and police barricaded a three-block radius around the mall.

Jacksonville Mayor Lenny Curry urged residents to avoid downtown on Sunday evening to allow police operations to proceed.

The Jacksonville Landing is an entertainment complex along the St Johns River, which includes restaurants and an indoor shopping mall.

A Jacksonville Sheriff's officer helps keep the perimeter secure as law enforcement investigates the shooting last night

A Jacksonville Sheriff crime scene unit van is seen as law enforcement investigates a shooting at the GLHF Game Bar attached to the Chicago Pizza place (seen behind the van)

The competition was held in a gaming bar that shares space with a pizzeria. Viewers could watch the games online and see the players

A man holds a sign in support of gun control outside of The Jacksonville Landing after a shooting in Jacksonville on Sunday

It was the site of a Donald Trump rally in October 2015 early in his campaign for the White House.

White House officials said the President had been briefed about the shooting.

President Trump has offered local officials any resources they need in responding to the shooting, according to Florida Governor Rick Scott, who was en route to the scene on Sunday evening.

EA Sports, which runs the Madden tournaments, said in a statement: 'The tragic situation that occurred Sunday in Jacksonville was a senseless act of violence that we strongly condemn.

'Our most heartfelt sympathies go out to the families of the victims whose lives were taken today and those who were injured. All of us at Electronic Arts are devastated by this horrific event, and we also join the community in thanking the first responders who were quickly on the scene. Our focus right now is on those affected, and supporting law enforcement as they continue their investigation into this crime.'

The shooting on Sunday follows close on the heels of another public shooting in Jacksonville, at a high school football game on Friday night, in which one was killed and two were injured.

The shooter in that incident, described only as a lone black male, is still at large and being sought by police.

Sunday's shooting struck a nerve with many in Florida, where the memory of the February school shooting in Parkland, where 17 died, is still raw.

Ahead of November's midterm elections, in which Floridians will choose a governor alongside their House representatives and one Senator, the conversation quickly turned political in the wake of the shooting.

'Too many lives are destroyed, while leaders take no action. It's time for new leaders,' tweeted Phillip Levine, the former mayor of Miami and one of the Democrat challengers hoping to unseat Republican Governor Scott.

Scott signed gun-control legislation after the Parkland shooting, including raising the age to buy a long gun to 21.

'We have got to change, we've got to really stop and say to ourselves, 'There's something wrong,'' the governor told reporters after visiting hospitalized victims of the shootings. 'Why are young men willing to give up their lives? Or why don't they value somebody else's life? We've got to figure this out. We don't ever want this to happen again.'