Northern Territory Police are warning a feud between two rival motorcycle gangs after an altercation at a Darwin nightclub threatens to put members of the public at risk.

Police on Friday said that on Thursday night a senior member of the Darwin Rebels bikie gang went to the Royal Darwin Hospital with head injuries consistent with having been assaulted.

"Police are aware of ongoing tensions between the Rebels and the Comancheros Outlaw Motor Cycle Gangs believed to have stemmed from an altercation that occurred in a Darwin nightspot several weeks ago," a police statement said.

"With this apparent act of retaliation and recent events in Victoria involving firebomb attacks on tattoo parlours associated with the clubs, we have genuine concerns for public safety," it said.

The man thought to have been beaten up has not made a complaint to police about the incident.

Police said that on Wednesday, as part of an operation targeting the distribution of the drug ice and other illegal substances, six men thought to be members of the Commancheros bikie gang were observed at Darwin Airport arriving from interstate.

Late on Thursday police from the Gangs Taskforce spoke with three men from the Comancheros bikie gang travelling to the airport. Two of those men left the NT.

Police are continuing to look for four members of the group they believe may have information that relates to the assault on the Rebels gang member.

The men are described as being possibly of Lebanese descent and driving a red Nissan X-Trail car, with registration CB3 4XQ.

"Recent events such as the melee on the Gold Coast in Queensland have highlighted the risk to the public these group can present," the police statement said.

This month in Melbourne two tattoo parlours were set on fire in separate attacks and a drive-by shooting occurred, all on the one night, in events suspected of being related to outlaw motorcycle gangs.

Earlier this week in Waco, Texas, a bikie shoot-out involving up to five different gangs claimed nine lives.