A man is said to have barricaded himself inside the store, according to the mayor. The TV channel reports that the shooter is probably dead.
– It is unacceptable. One shooting is one too many, but these mass shootings are very difficult to accept, Deegan told the television channel.
The incident must have occurred at 1 p.m., local time.
Large parts of the course of events are still unclear. Police have cordoned off a large area around the store and a task force has been sent to the scene, according to News 4 Jax.
The public is asked to evacuate the area.