Police are desperately searching for two men after a 23-year-old man was stabbed to death in a "horrific" attack outside a Brisbane gym on Monday.

Police have put a public callout for help to locate 35-year-old Thomas Myler and 24-year-old Kyle Martin as they investigate the alleged murder.

Detective Superintendent Andrew Massingham said the men could potential be armed, and that was in the interests of public safety that both men be taken into police custody immediately.

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He said police believed Myler had cut his hair since the attack on Monday, and that the two men were still believed to be in Brisbane.

After police called for the public's help on Monday, two members of the public had come forward with clear dashcam footage related to the incident.

He said the footage showed the lead up to the "horrendous crime".

"It's horrific, it's confronting, it's very difficult to watch."

Superintendent Massingham said police carried out searches at properties in Ransom and Birkdale yesterday afternoon.

A third search at a property in Birkdale this morning led to police arresting a 34-year-old man.

Another 34-year-old man, from East Brisbane, was arrested on Monday nearby the scene of the attack.

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Superintendent Massingham said it was believed the four men could all be linked to the "fairly unknown" 13 Kings gang, which has a presence in Capalaba.

He said police believed the men had been surveilling the victim before he was attacked on Monday.

He said detectives believed the victim realised he was being followed and pulled into the car park of a Mansfield gym to seek refuge when he was attacked about 1pm on Monday.

The victim was pursued by a black Audi and rammed by a Nissan Patrol before five men piled out of the cars and smashed the driver's side window with a crow bar.

They chased the victim as he tried to flee from the passenger door.

He was stabbed multiple times in the torso by one of the men before four of the men fled in the Nissan Patrol.

The fifth man fled on foot.

Superintendent Massingham said police had not found the Nissan Patrol, which they believed was still in the area.

Anyone who may have seen the men people are looking for, or knows their whereabouts, is urged not to approach them but call Triple Zero.