Mass Shooting Reported at Video Game Tournament in Florida
Preliminary news reports say 11 people have been shot and witnesses say there are four dead.
Sheriff Mike Williams said the lone shooter, a white male, was among the dead. He declined to confirm the death toll.
"We just finished clearing the Jacksonville Landing... and the scene is secure," Williams said at a news conference.
Authorities used Twitter to tell people still hiding at the scene of the shooting to call 911 to help police locate them. Those in hiding were also warned not to "come running out," as SWAT teams are conducting a search.
The shooting took place during an online gaming tournament at a restaurant and sports bar. 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.
Florida Governor Rick Scott said he had promised Mayor Lenny Curry and other officials in Jacksonville any state support they might need.
Jacksonville is about 480 kilometers north of Parkland, where a gunman killed 17 people at Marjory Stoneman Douglas High School in February.