Ron Lendvay, director of investigations for the Jacksonville Sheriff's Office, said several shots rang out about 12:35 p.m. Sunday on a boulevard in the stadium's general area and that five men and one woman were hit by gunfire. All were rushed to hospitals, and the sheriff's office tweeted that three of the victims were in critical condition. The victims ranged in age from their 20s to the 70s, according to Lendvay.
The shooting broke out before the scheduled 1 p.m. start of play. Lendvay reported no link to the game, which went on without incident, and said investigators were investigating whether it was gang-related.
The Texans won their fourth consecutive game Sunday, defeating the Jaguars 20-7 to take a one-game lead in the AFC South at the stadium, TIAA Bank Field.
Local media reports cited authorities as saying the shooting had had no impact on game day activities though some fans headed to the game reported hearing the gunfire.
Lendvay told reporters that a shooter fired from the passenger side of a gray, four-door sedan driven by a companion and that the victims were hit outside on the sidewalk near a laundromat. He said the car immediately drove off and that detectives had been checking surveillance video in hopes of identifying the vehicle and those involved.
"There were at least two people in the car," Lendvay said. He added that investigators didn't know if any others were in the car and he didn't rule out the possibility of other shooters elsewhere.
"This may be gang-related based on information obtained in the early stages of the investigation," he told reporters Sunday, declining to elaborate.
Some fans told local broadcast outlet New4Jax that they heard shots as they headed to the stadium.
"We had just parked our cars," Vanessa Holmes told the new outlet, adding she and some family members were walking when it happened. "We heard the shots. We didn't know if we should fall to the ground. We didn't know what to do," she said.
Others told the broadcast outlet that they saw people running out of the coin laundry business when the shots were fired.
Some said it was a series of shots.
"We were over there talking and suddenly, it was like ten gunshots. We ran and went for cover and then I saw the police, and people were crowding down there," a woman identified as Yvonne Lee told News4Jax.
An update on the conditions of the wounded wasn't immediately available late Sunday and they were not identified by name.
"A couple of them were in very serious condition on their arrival at the hospital," Lendvay said. He added that five of the wounded were rushed by paramedics for emergency care and the sixth by private vehicle.
He said authorities have been unable to immediately determine whether there was any relationship among the wounded, noting none could be immediately interviewed though authorities hoped to do so later.
"It's hard to say if they are all associated or not," he added.
Lendvay spoke near the scene Sunday afternoon even as the game was in progress, saying investigators had cordoned off the area but fans who had cars parked in the area could expect an escort to their vehicles so they could leave unhindered after play was over.
Jacksonville City Councilman Reggie Gaffney, who represents the district where the shooting occurred, told local media he was aware of crime problems in the neighborhood and urged a greater law enforcement presence there.
"In talking to the sheriff's department; they are going to beef up patrols ...We have a crime issue," Gaffney said. "Every other week and every other month out there, it's too much."
Florida Gov. Rick Scott also said in a statement that he had reached out to Jacksonville Sheriff Mike Williams, offering any state resources that the city may need.