Gun accused in bid to stay silent

A man accused of handing over the gun used in the fatal shooting of Sydney police accountant Curtis Cheng is trying to stop the NSW Crime Commission from forcing him to answer questions.

Talal Alameddine has launched legal action in the Supreme Court after he was brought before the commission on October 7 to answer questions about Mr Cheng's shooting outside police headquarters at Parramatta just five days earlier.

Alameddine, who has been charged with breaching a firearms prohibition order and hindering police, is now seeking an order to prevent the crime commission from forcing him to answer certain questions that were put to him.

In documents released to the media on Friday, Alameddine states the crime commission had told him during questioning on October 7 that he was a suspect in the homicide investigation into Mr Cheng's death.

He took the witness box at the commission on October 7 and answered several questions put to him but refused to answer others.

Alameddine is now seeking a Supreme Court review of the commission's decision on October 7 that requires him to answer certain questions.

He is also attempting to get an injunction issued preventing the commission or any of its officers from taking any further steps in respect to the summons they served on him earlier this month.

The development comes a week after Alameddine first fronted Parramatta Local Court in relation to Mr Cheng's death.

According to documents tendered on that occasion, Alameddine met Raban Alou between 1.40 and 2.55pm at Merrylands on October 2 and gave him a .38 Smith & Wesson revolver.

About two hours later, 15-year-old Farhad Jabar allegedly used the gun to shoot Mr Cheng outside police headquarters in Parramatta before he was shot by police.

Both Jabar and Mr Cheng died at the scene.

After the killing, court documents allege Alameddine, 22, damaged and hid a mobile phone and SIM card on October 7 with the intention of hindering police.

Neither Alameddine nor Alou appeared or applied for bail when their matters came before separate Sydney courts.

Alameddine's Supreme Court matter will return next month, before his mention at the local court on December 10.