A 23-year-old man has been fatally stabbed at Mansfield in Brisbane's south-eastern suburbs, with police investigating bikie gang links to the attack.

"We have what is quite a graphic and disturbing scene," Queensland police Detective Superintendent Andrew Massingham said.

He said the 23-year-old man entered the car park of a gym at the intersection of Brigadoon Street and Pine Mountain Road in a white Mercedes Benz.

The man was then pursued by a black Audi, and as he tried to exit the car park was rammed by a white Nissan Patrol.

Five men then got out of the cars.

"They have approached the driver seat … They've then used a crowbar to smash the window."

Detective Superintendent Massingham said the man attempted to flee out the passenger side door but was chased down by two of the men.

He was then stabbed multiple times in the torso by one of the men.

Four of the men left the scene in the Nissan Patrol, with the fifth fleeing on foot towards Flame Tree Court.

Officers from the homicide squad and the anti-bikie Taskforce Maxima are involved in the investigation.

"The motive at this stage is unknown," Detective Superintendent Massingham said.

But he confirmed that bikie links are being investigated.

"That is front and centre of what we are doing at the moment."