A 19-year-old woman is fighting for her life in a hospital after she was shot in the head and neck outside a venue hosting a boxing event in Australia’s Brisbane.

She was among the four people injured in the drive-by shooting outside Fitzy’s Loganholme, south of Brisbane, on Saturday, Queensland police said.

The shooting unfolded at around 8.18pm on Saturday when a Mitsubishi pulled up near a group of people gathered in the passenger drop-off zone outside Fitzy’s.

Queensland police detective inspector Ian Galpin said investigators believed two men wearing balaclavas and gloves were inside the vehicle and allegedly fired several shots through its front window, hitting four people.

The Jimboomba woman, 19, was in critical condition and has undergone surgery, police said.

Mr Galpin said the woman was not believed to be a target but an “innocent bystander”.

“It appals me greatly. It’s horrific. It’s something that her family should never have to go through,” he said.

“This is a horrific event in a public space where adults and children are simply trying to enjoy a sporting event, and this incident is clearly not acceptable.”

The three injured men also underwent surgery after they received gunshot injuries.

A 38-year-old Browns Plains man was shot in the abdomen and arm. A 37-year-old Salisbury man, shot in the abdomen. They were in serious but stable condition.

A 27-year-old Cornubia man, also shot in the abdomen, was in stable condition.

A manhunt has been launched for at least three people, including one of the occupants of the car who is believed to be injured, possibly with burns.

He said the Mitsubishi car was set alight on Maloney Road at Waterford West after the incident and the person could have been injured.

“CCTV and witness accounts identified two males within that vehicle, both wearing balaclavas and gloves,” he said.

“Subsequent CCTV inquiry identified a second vehicle which collected the occupants of the Mitsubishi after they had set the vehicle alight,” Mr Galpin said.

Mr Galpin said it was too early to determine whether the shooting was linked to organised crime.

“This is a horrific event in a public space where adults and children were simply trying to enjoy a sporting event and this incident, it’s clearly not acceptable. We will not tolerate it.”

Logan mayor Jon Raven said the shooting had left residents frightened and sent shock waves through the local community.

“This has sent a shock wave through Logan. We’ve never seen something like this in Logan before,” Raven told the Today show on Sunday morning.

“Our hearts go out obviously to the victims and the staff and the people at this boxing event.

“I’ve been to one of these events before, they’re [a] really family friendly environment, and I know there’s lots of children who were there, and this will impact them for the rest of their lives.”

Queensland police deputy commander Chris Stream described the scene as “confronting”.

“A number of people had suffered gunshot wounds,” he told Today.

Logan City Titles said they were “heartbroken about the incident that occurred at the fight night”.

“Logan City Titles was a family event, an event for our community, showcasing local talent, hard work and everyone’s skills inside the ring.

“These types of incidents have no place in the boxing community or any part of the broader community.”