By RUSS BYNUM and BRENDAN FARRINGTON , Associated Press

JACKSONVILLE, Fla. (AP) — A gunman opened fire Sunday at an online video game tournament that was being livestreamed from a Florida mall, killing multiple people and sending many others to hospitals, authorities said.

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.

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.

Jason Lake, the founder and CEO of compLexity, a company that owns professional e-sports teams, said on Twitter that one of his players, 19-year-old Drini Gjoka, was shot in the thumb.

Gjoka tweeted: "The tourney just got shot up. Im leavinng and never coming back." Then: "I am literally so lucky. The bullet hit my thumb. Worst day of my life."

Marquis Williams, 28, and his girlfriend, Taylor Poindexter, 26, both from Chicago, were ordering pizza at the bar when they heard the gunfire. Williams said people trampled each other trying to get away.

"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," said Williams, who participated in the tournament earlier.

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.

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.

White House spokeswoman Sarah Huckabee Sanders said President Donald Trump had been briefed on the attack and the White House was monitoring the situation.

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

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Farrington reported from Tallahassee, Florida. Laura Heald also contributed to this report from Jacksonville, Florida.

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