NSW police officers have swooped on several properties in Sydney's south in relation to the daylight execution of former bikie boss Mahmoud "Mick" Hawi.

Investigators have raided six properties looking for evidence relating to the death of Mr Hawi, who was gunned down outside a Rockdale gym on February 15.

Blowing bubble gum at the camera, bikie boss Mick Hawi arrives at court for manslaughter over the Sydney Airport brawl in 2009. Credit:Edwina Pickles

The former Comanchero president was treated by NSW Ambulance paramedics before being taken in a critical condition to St George Hospital, where he later died.

Detectives from the State Crime Command’s Criminal Groups Squad established Strike Force Amirs to investigate.

Strike force detectives, assisted by Strike Force Raptor and the Public Order and Riot Squad, executed search warrants at properties at Bardwell Park, Beverly Hills, Brighton-le-Sands, Carlton, Hurstville and Padstow, from 7am on Thursday.

Police said that investigators had located vehicles of interest, which would be seized for forensic examination.

AAP, Fairfax Media