The man who murdered former Rebels bikie club president Nick Martin in a sniper-style execution at a Perth speedway was investigated by the Australian Federal Police (AFP) for terrorism offences, a court has heard.

The shooter, who cannot be identified, has been giving evidence at the trial of David Pye, who is accused of paying for the assassination of Mr Martin.

The slim, bearded man has taken his place in the witness box in the WA Supreme Court, behind protective glass, for a second day.

He said he was interviewed by the AFP in April 2021, following his arrest over the killing at Kwinana Motorplex.

A man in a red singlet stands talking to another man who is wearing a bikie jacket.

Nick Martin was gunned down during a night out at a Perth speedway. (ABC News)

The man had earlier told the court Mr Pye first contacted him when he was working as security in northern Iraq for the Shadows Of Hope charity group.

Under questioning from Mr Pye’s lawyer David Hallowes, the man said he was “absolutely” concerned about a federal police investigation regarding “foreign incursion type of offences”.

Mr Hallowes asked if he was being investigated in relation to terrorism offences and he agreed he had been.

ISIS massacre link

Mr Martin’s assassin was specifically asked about Mount Sinjar in Iraq, and the court was shown a message to a former schoolteacher in which he referred to a massacre of Yazidi people by ISIS.

“ISIS came up the mountain” and they “all had to fight”, including doctors, according to the message.

The US was dropping air supplies, the message said, “and bombing them around us”, and UNICEF supplies had to be accessed from sea containers.

A man attempting archery on a beach

The man convicted of killing Nick Martin told the court he had been questioned by federal police over his activities in Iraq. (Supplied)

But today, the man told the court he was not present when that happened and was more broadly referring to Shadows of Hope.

However, he admitted he had been to Mount Sinjar at another time, and had a National Geographic press card to get him to places where “credentials were required”.

An aerial shot of a man jumping from a plane.

The man accused of killing Nick Martin at the Kwinana Motorplex. (Supplied)

Mr Pye, 43, a former Comancheros bikie member, is facing six charges including murder.

It is alleged he hired the assassin, who is serving a 20-year jail sentence for murdering Mr Martin, offering him $150,000 for the hit.

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