It has been suggested to police that some of the people also have ties to bikie gangs.

"Now whether that's as a consequence of their membership or whether it's coincidental, that remains to be seen," Superintendent Fleming said.

The small inflatable boat believed to have been involved in the shooting, found in the Norman Park reach of the Brisbane River Monday afternoon, was a tender from a larger vessel stolen from Surfers Paradise between December 26 and 29.

Superintendent Fleming said it may have been transported to Brisbane via road some time later.

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An appeal has now been made to anyone who may have seen or have footage of the vessel on the river around the time of the shooting incident, or between Brisbane and Surfers Paradise since it was stolen.

Police have also released further CCTV footage of a man they are looking to speak to about the earlier arson attempt, seen walking along a pathway near the bar with a bag and dark blue trousers or work pants, black-top sneakers, a high-vis jacket over a black hoodie and dark cap.

Earlier footage released showed a man in similar clothing throwing something through a door of the bar before it went up in flames.

Despite the "serious" nature of the crimes, Superintendent Fleming urged the public to be "alert, not alarmed" with police increasing patrols in the area and management also boosting security efforts.

"[But] crimes like these are of a particular abhorrence to me, because an innocent third party who has got nothing to do with it could potentially die - that's not tolerable."

There was a small amount of damage to the venue following the shooting, but Howard Smith Wharves chief executive Luke Fraser said the bar was open for business on Monday evening.

"We are continuing to assist police with their investigation and as a precaution have put in place
additional security measures," he said.

Witnesses or anyone with information are urged to contact Policelink on 13 14 44 or Crime Stoppers on 1800 333 000.