West Australian police will sift through recent travel permits as they race to discover who was behind the public slaying of senior Rebels bikie Nick Martin.
Martin was shot dead on Saturday evening while attending a drag racing event at Perth Motorplex with his wife and other associates.
The 51-year-old received a single gunshot wound to his torso, with detectives investigating the possibility he was shot by a sniper.
A $1 million reward is being offered for information leading to the arrest and conviction of his killer.
Police have declined to say whether they believe the assailant may have come from the eastern states, but Assistant Commissioner Brad Royce has confirmed Operation Ravello detectives will seek recent G2G travel permit records.
The permits are mandatory for all interstate arrivals.
“That’s one of the lines of enquiry we will take,” he told reporters on Wednesday.
“Those details, though, aren’t freely available – we have to go through court processes and warrants to get those because people’s privacy is at stake as well.”
Police on Wednesday arrested Martin’s son-in-law Ricky Chapman, a former Bandidos member, for breaching his parole conditions after he was wounded in the attack.
Chapman, 31, underwent surgery after being injured by the same bullet that killed Martin.
He was arrested overnight at his home after authorities issued a return to prison warrant, alleging he had breached parole by associating with an outlaw motorcycle gang.
The venue in Kwinana Beach has now been returned to its owners after police scoured surrounding bush to determine where the shooter was located.
A bullet fragment recovered from Chapman’s arm has been sent to ballistics experts and footage from the event is being reviewed.
“Until such time as we’ve been right through the fragments … (and) map out the entry wounds and where people were, there’s a whole lot of reasons it could be closer in or further out,” Assistant Commissioner Royce said.
An unrelated five-year-old boy sitting on the lap of Martin’s wife was grazed by a bullet fragment but did not require medical treatment.
WA’s government is prepared to consider offering immunity from prosecution to informants as long as they were not directly responsible for the killing.
“Shooting someone with a sniper rifle at a public event is outrageous. It’s evil,” Premier Mark McGowan told reporters.
“The perpetrators will be brought to justice … and they will go to jail for life.”
More than 100 officers have been tasked to Operation Ravello, with the brazen public slaying sparking fears of gang retributions.
Detectives have raided a number of properties associated with outlaw motorcycle gangs including Rebels, Mongols and Hells Angels clubhouses.
Martin, who survived an attempt on his life in 2011 when he was shot by a Rock Machine bikie, had recently been the Rebels’ WA president, but detectives are uncertain whether he retained that role at the time of his death.
He was facing charges over financial misconduct and had been bashed by a Hells Angels bikie weeks earlier.