Gardai are still trying to identify all the witnesses to the killing of drug dealer killing of drug dealer Seamus "Shavo" Hogan who was shot dead on Saturday night.
A Garda at the centre of the investigation said no one as yet has been brought in for questioning.
Gardaí were house-to-house inquiries in the immediate area surrounding the Crumlin club, focussing mainly on routes off the Clogher Road on Dublin’s southside
He added it was still unclear as to whether a video camera at the Transport Club in Crumlin had captured any useful evidence of the shooting.
Hogan was killed when two masked men fired six shots at him in the grounds of the club.
Hogan was facing charges in connection with the seizure of £500,000 worth of cannabis resin and was also being investigated by the Criminal Assets Bureau and the National Drugs Unit.
A post-mortem has found that Hogan (47) died from two gunshot wounds.