Two more people have been arrested in relation to the alleged mistaken identity kidnapping and murder of Sydney grandfather Chris Baghsarian.
Mr Baghsarian was allegedly kidnapped from his North Ryde home in February, in what police have described as a case of mistaken identity.
His remains were found more than 10 days later near a golf club in Pitt Town in north-western Sydney.
Police arrested and charged 29-year-old Gerard Andrews and 24-year-old Daniel Stevens the following day with the kidnapping and murder.
Police arrested another two people, a 23-year-old man and a 23-year-old woman, this morning while executing a search warrant in Seven Hills.
The man and woman were taken to Riverstone and Blacktown Police Stations, where they are assisting with inquiries.
Investigations ongoing
The case made headlines after videos and images circulated appearing to show the 85-year-old being tortured in a safe house in Dural.
NSW Police last week released fresh CCTV footage showing three people walking on a street near the Dural site.
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Police also released images of a blue car they believe is involved in the kidnapping.
It is understood police believe the intended target of the alleged kidnapping was a relative of Sydney businessman Dimitri Stepanyan.
Detectives have said that Mr Baghsarian’s family never received any demand for ransom or communication from his captors.

Mr Baghsarian’s remains were found near a Pitt Town golf club. (ABC News)
Mr Baghsarian’s relatives have described the grandfather as a devoted family man.
“He is deeply loved, gentle, and the kindest person we know — someone who would never hurt a fly,” the family said in a statement.
Mr Andrews and Mr Stevens did not apply for bail when they faced court last month.
They are due to front court again in April.
Investigations into Mr Baghsarian’s death are ongoing.