Police are urging people in Norfolk to remain vigilant after a cold caller pretending to be a police officer once again tried to con a vulnerable person to withdraw a large sum of money.

On each occasion the victims have received a call on from someone claiming to be a 'Detective Sergeant John Carod' or a 'Detective Sergeant John Witmore' either stating he needed help with an investigation or officers had intercepted some males who had their credit card details.

The suspect then asks for victims to withdraw a large sum of money from their local bank or to put together gold and jewellery items and they would arrange for them to be collected, mainly by taxi.

The latest incident happened in the Horsham St Faith area.

It comes after previous incidents in recent months where elderly residents have been targeted in Wymondham, Norwich, Gorleston, Winterton, Great Yarmouth and Potter Heigham.

Investigating officer, Detective Inspector Chris Burgess of Norwich CID, urged for residents to be vigilant to this scam.

He said: 'We're urging members of the public, particularly the elderly who are primarily being targeted, to be vigilant to cold calls made on the telephone.

'Genuine police officers or staff would never approach residents and ask for cash withdrawals to be made or for people to purchase items on their behalf.'

Last month a 92-year-old woman from Swainsthorpe was conned into handing over tens of thousands of pounds worth of gold and jewellery on her doorstep to a man claiming to be a police officer.

And in a similar case a 72-year-old woman from Wymondham withdrew 11,000 euro, which is about £9,700, and handed it over to a cold caller who claimed they were a police officer.

Det Insp Burgess added: 'I would ask people with vulnerable relatives, friends or neighbours to make sure they are aware of this type of scam.'

Anyone with concerns about such calls should contact Norfolk Constabulary on the non-emergency number 101 or 999 if a crime is in progress. Alternatively, contact Action Fraud on 0300 123 2040.