A gunman opened fire Sunday during an online video game tournament that was being livestreamed from the Jacksonville Landing mall, killing multiple people and sending many others to hospitals.

Sheriff’s officers did not immediately confirm the number of dead at the Jacksonville Landing, a collection of restaurants and shops along the St. Johns River.

But an official close to the investigation said the shooting left four people dead and that the gunman died from a self-inflicted gunshot wound. It was not clear if the official included the suspect in the death toll.

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The official spoke on the condition of anonymity because the person was not authorized to release information.

Sheriff Mike Williams said authorities had yet to identify the suspect who attacked the video football tournament, which featured the game “Madden NFL 19.” The competition was held in a gaming bar that shares space with a pizzeria. Viewers could watch the games online and see the players.

Investigators were looking into online video that appeared to capture the scene right before the shooting began, Williams said.

A red dot that appears to be a laser pointer is visible on the chest of a player seconds before the first of a dozen gunshots rings out.

The sheriff’s office used Twitter and Facebook to warn people to stay far away and to ask anyone who was hiding to call 911.

The sheriff’s office did not provide any other information, but also warned reporters to stay away from the area.

Police barricaded a three-block radius around the mall. Officers and Coast Guard boats patrolled the nearby river. Many ambulances could be seen in the area, but the mall area appeared empty of all but law enforcement. Police also took up positions on a bridge overlooking the river.

The Jacksonville Landing, in the heart of the city’s downtown, also hosts concerts and other entertainment and was the site of Donald Trump rally in October 2015 early in his campaign for the White House.

On an online stream of the Madden event posted to the website Twitch, several loud gunshots could be heard and the game abruptly stopped.

After several gunshots, people scream and one person cries out, “Oh f**, what’d he shoot me with?” The stream did not show the shooting.

The event was the Southeastern Qualifier for the Madden NFL Championship Series for Madden NFL 18, according to the bar’s Facebook page.

“This is your chance to earn your spot in the first Major’s Live Finals happening in October 2018. Don’t hesitate to secure your spot,” the post read in part.

President Donald Trump has been briefed on the situation, White House press secretary Sarah Sanders said.

Federal law enforcement officials are monitoring the situation in Jacksonville. The Bureau of Alcohol, Tobacco, Firearms and Explosives (ATF) is responding to the scene in Jacksonville Landing.

Deadly Shooting at a Jacksonville’s Online Video Game Tournament