Police from Newcastle City Local Area Command have charged a man with impersonate police, robbery, posses unauthorised pistol and drug-related offences.

About 12am yesterday (14 April 2015), a 39-year-old Lambton man and his 20-year-old son were moving a motor vehicle in Heaton Street, Jesmond.

It will be alleged two men approached the pair and informed them they were police officers.

Police will further allege the men assaulted the father and son before stealing a wallet, mobile telephone and other belongings.

Around 9am today (15 April 2015), police had cause to speak with a 22-year-old Thornton man who was seated in a motor vehicle in Fern Street, Islington.

The man and the motor vehicle were searched, during which police allegedly located property belonging the 39-year-old man. Police also seized an unauthorised pistol, an amount of money, and illegal drugs.

Police arrested the man and took him to Newcastle Police Station, where he was charged with robbery in company, impersonate police, supply prohibited drug, possess unauthorised pistol, possess prohibited drug, and deal with the proceeds of crime.

The man was refused bail, and is due to appear before Newcastle Local Court on the 16 April 2015.

The investigation is continuing, and anyone with information that may assist police is asked to contact Newcastle City detectives or Crime Stoppers on 1800 333 000.