NSW Police video shows two men being arrested over the alleged kidnapping murder of Chris Baghsarian.

Two men have been arrested in relation to the alleged kidnapping and murder of Sydney grandfather Chris Baghsarian.

The 85-year-old was abducted from his home in North Ryde at 5am on February 13 in a case of mistaken identity.

On Wednesday morning, a 29-year-old man in Kenthurst and a 24-year-old man in Castle Hill were arrested during raids at two separate addresses.

Chris Baghsarian looking at the camera the man was mistakenly kidnapped

Two arrests have been made in relation to the alleged kidnapping and murder of Sydney grandfather Chris Baghsarian. (Supplied: NSW Police)

The men were taken to Riverstone Police Station where they are undergoing questioning.

Charges have not been laid.

Baghsarian arrests (2)

Police arrested the men after raiding two houses. (Supplied: NSW Police)

Police officers outside a house.

Police arrested a man at a Kenthurst home over the alleged kidnapping and murder of Chris Baghsarian. (ABC News: Gavin Coote)

The arrests come less than 24 hours after police discovered human remains near a golf club in Pitt Town in the north-west fringes of Sydney, as the search for Mr Baghsarian reached its 11th day.

Police said the remains were not able to be positively identified as of yet, but were suspected to belong to Mr Baghsarian.

Family welcome development in case

Aerial shot of NSW Police in dark uniforms walking in a line

A forensic examination is under way to identify the remains. (ABC News)

Mr Baghsarian’s family on Wednesday released a statement via NSW Police requesting privacy as they “continue attempting to come to terms with this incident”.

“We welcome the news of the recent arrests in relation to the kidnapping of our father and grandfather,” the statement said.

In recent days, officers had scoured bushland in Glenorie following the sighting of a Toyota Corolla forensically linked to a “stronghold” in nearby Dural.

Police believe the derelict Dural property was used as a base by Mr Baghsarian’s captors.

A car is parked at the front of a suburban house in the dark

CCTV captures movement in street night Chris Baghsarian was abducted

Images and video had circulated of Mr Baghsarian tied up and being assaulted, prompting police to repeatedly issue urgent pleas for his safe return.

Detective Acting Superintendent Andrew Marks said on Tuesday police were investigating whether the car in question was driven out to Glenorie and Pitt Town within less than 48 hours of Mr Baghsarian’s abduction.

A formal process, including forensic examination, is under way to identify the remains.

Police said no further information was available at this time.