The homes of at least four people banned from holding firearms have been raided on the back of an alleged threat to shoot a Sydney police station. 

Laws giving police the power to search the home and cars of anyone subject to a Firearms Prohibition Order (FPO) without a warrant were used to roll out the morning raids on Wednesday. 

Police raid the Alameddine house in Merrylands on Wednesday. Photo: Peter Rae

The heavy police response came after the Middle Eastern Organise Crime Squad began investigating two weeks ago an alleged threat to shoot up the Merrylands Police Station.

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For the Alameddine family it was the third time this year the clan woke to find tactical police at their doorstep. 

At least three members of the family, including brothers Rafat and Talal, are subject to an FPO, which bans individuals from owning or using a firearm. 

Police speak to a man outside the Merrylands raid. Photo: Peter Rae

Talal, 22, was charged last month for allegedly supplying the handgun that Farhad Jabar used to shoot dead NSW Police accountant Curtis Cheng in Parramatta.

The Lockwood Street house was raided days after the terror attack. 

The Alameddine house was also raided in February by police looking for guns after they thwarted a potentially dangerous disruption at a Sydney court complex. No one was charged. 

The Haouchar family home was raided by police on Wednesday morning. Photo: Peter Rae

Around the corner on Blackwood Road on Wednesday, police were also searching the Haouchar home.

The Haouchars, who are closely associated with the Alameddines, recently welcomed family member Osman Haouchar, 26, back from the Middle East, where he said he was as humanitarian aid volunteer. 

Mr Haouchar, who lost one eye when his house was targeted in drive by shooting several years ago, was slapped with an FPO before he left the country earlier this year for a Turkey-Syrian border town.

Police search a car outside the Alameddine household. Photo: Peter Rae

The orders give police enhanced search powers to search a person, their property or their vehicles without a warrant.

"That's the power we used today," State Crime Commander Assistant Commissioner Mark Jenkins said. 

"As I say, we will use a suite of powers whenever we investigate these particular types of threats. We make no apology for that."

A NSW Police raid in Merrylands this morning. Photo: NSW Police Media Unit

No charges were laid as a result of Wednesday's raid and police say they found nothing of significant interest.

As police packed up and left his single-level brick home on Wednesday morning, Mr Haouchar returned and laughed off the attention directed at him. 

"I would like to thank the NSW Police Force for once again wasting Australian taxpayers' money," he told reporters. 

Detectives speak to a man after a raid in Merrylands. Photo: NSW Police Media Unit

Asked if police detailed what they were looking for, Mr Haouchar replied: "No."

"The NSW Police are wasting the money of taxpayers that could be used for other things," he said. 

Mr Haouchar was questioned by Australian Federal Police last week after arriving back in Sydney. 

Osman Haouchar, 26, recently returned from the Turkey-Syrian border. Photo: Supplied

His sister was married to a man who reached "martyrdom", according to a friend, and was killed in the Middle East last year. 

Sources have confirmed Mr Haouchar left Australia earlier this year at the same time police wanted to question him over the shooting of nightclub boss John Ibrahim's younger brother, Michael.

Police are expected to question him over the shooting in Sydney's CBD in January now he is back on home soil. 

It is unclear if Mr Haouchar was aware police wanted to talk to him about the incident. 

There has been long-running tensions between the two dominant families, sources say.