Sydney police station 'threat' sparks raid

A threat allegedly made against a Sydney police station has sparked raids on two western Sydney homes, including one linked to a terror act.

NSW Police raids on two homes in Sydney's south west have come up empty handed. (AAP)

The home of the man accused of supplying the gun which killed police accountant Curtis Cheng has been raided again following alleged threats against a Sydney police station.

Police swooped on two homes in Merrylands at around 6am on Wednesday - the Lockwood St home of Talal Alameddine, who's in police custody, and another home in Blackwood Road.

Although police didn't find any items of interest, they warned more raids are possible.

The Lockwood St home was targeted in counter-terrorism raids in October after Mr Cheng was shot outside the Parramatta police headquarters by 15-year-old Farhad Jabar.

Alameddine is accused of providing Jabar with the gun he used to kill Mr Cheng on October 2.

Police said on Wednesday the Middle Eastern Organised Crime Squad had been investigating the threat for two weeks before they descended on the homes.

Merrylands police station was the target of a threat made on Facebook, according to media reports.

Assistant Commissioner Mark Jenkins made no apology for the searches, which were made using anti-firearms powers.

Firearms prohibition orders ban certain individuals from owning firearms and give police the power to search their property or vehicles without a warrant.

"They can't take any comfort from the fact that we found nothing this morning," Mr Jenkins said.

"This may not be the last you see of these types of searches.

"These searches were a direct result of that specific information."

An older man and woman were inside the Lockwood St home during the raid while a younger man walked outside and watched over police as they pulled apart a black Jeep and searched a white car and ute.

He took a photo of media outside his house and smoked a cigarette as police continued their search.

Once the raid was over the younger man took off in the Jeep.

"I want nothing to do with you," he told reporters.

The Blackwood Rd home is the residence of Osman Haouchar, who said police were wasting money on the raid.

"The NSW police are wasting the money of taxpayers," he said, adding that he didn't know why they had come to his home.

Mr Haouchar laughed when asked if a threat had been made to a police station.

Alameddine was arrested and released without charge after police raids on October 7.

He was arrested again a week later and charged with supplying the gun, breaching a firearms prohibition order and hindering police.

Last month, Alameddine's lawyers applied for bail but Magistrate Margaret McGlynn refused, saying she believed he posed "a great threat to the safety of the community".

Alameddine is due appear in court next week.

Jabar was shot dead outside police headquarters on October 2 when officers returned fire.