The authorities in Jacksonville, Fla., are investigating a shooting at a bar on Sunday that was hosting a live gaming event during which 12 gunshots could be heard.
There was no immediate confirmation from the police about casualties.
Just before the shots were heard on the live stream, a red laser dot appeared on the chest of one of the players, who was wearing white headphones and a red sweatshirt. The video of the players then disappeared.
Sujeil Lopez was at home in Tampa Bay, Fla., when she got a call that her son Larry, 25, had been shot.
“I have to get to him. I am four hours away from him and I have to get to my son,” Ms. Lopez said on the phone.
“He was shot three times, once on the nipple, once on his hand and somewhere else,” Ms. Lopez said. She did not know his condition.
Her son is a professional video game player for the Bucks Gaming team, according to his Twitter profile.
Another person on Twitter, Drini Gjoka, said a bullet struck him in a thumb.
On Twitter, the Jacksonville Sheriff’s Office said there had been a mass shooting at the Jacksonville Landing, a collection of restaurant and stores. “Stay far away from the area. The area is not safe at this time,” it said in the tweet.
In another tweet three minutes later, the office said: “We can’t stress enough to stay away. Many blocks away.”
The shooting happened at the GLHF Game Bar, which was hosting a tournament that viewers could watch on Twitch, a gaming network owned by Amazon.
A video clip shared on Twitter, which has since been taken down, showed the football video game Madden on a television screen.
Someone playing as the Atlanta Falcons appeared to have scored, and was kicking off. Tournament commentators remarked that the players were so good that it would not be easy to knock anyone out of the tournament.
Then the sound of gunfire begins. Several shots are heard, one after another.
“Run run run run run pass run run run,” one viewer said in a comment stream.
Then as the shots sound, commenters repeatedly said “oh my god.”
“Is there a shooting?” a viewer asked.
“That’s a gun,” said another.
The video then cut off.
The bar was scheduled to host a qualifying round for the Madden NFL Championship Series, a gaming tournament. It was using Twitch, a popular live-streaming gaming platform, to allow other gamers to watch players participating in the tournament.
Spectators watch the games, hoping to pick up skills and tips from more experienced gamers.
Sandra E. Garcia, Melissa Gomez, Matt Stevens, Alan Yuhas and Mihir Zaveri contributed reporting.
