Cops close in on Sydney bikie boss killer

Detectives are circling the people who killed Mahmoud "Mick" Hawi, months after the former bikie boss was gunned down in Sydney.

Police swooped on six properties in Sydney's south on Thursday, seizing four cars which they say were used in planning the daylight shooting which claimed Hawi's life in February.

A total of six cars - including a burnt out Mercedes found near the crime scene a few hours after the attack - have now been seized.

Some contained forensic evidence which made Thursday's raids possible.

The properties targeted had no specific links to the Comancheros Motorcycle Club which Hawi once led, police said.

"At the moment we would say there would be a number of people feeling very uncomfortable, and we would like them to feel uncomfortable," Detective Superintendent Deb Wallace said on Thursday.