Police have issued a fresh scam warning after two people were conned out of almost £13,000.
Both victims were taken in by fraudsters claiming to be from BT. One lost almost £10,000, while the other had £2,500 taken at the weekend.
Chief Superintendent Simon Walls said: "One victim was tricked into giving their bank details over the phone. The other victim was kept on the phone for around three hours and persuaded to download software, which resulted in the victim being swindled out their hard-earned money.
"I cannot stress enough just how important it is to be scam aware and to know how easy it is to fall victim to a scam if you don't spot the signs.
"I want to appeal to family members to do all they can to let their loved ones know, especially those who are older and vulnerable, never to give out any kind of financial details over the phone or to download software during a call unless they are 110% sure it is safe to do so.
"Scammers are creative and will do whatever they can to con people out of money. They don't care who their victim is, they just want the money and will employ whatever tactic is necessary."
Chief Supt Walls urged people to speak to older members of their family and tell them legitimate providers would never seek their personal details, such as banking information, over the phone.
He said: "Tell them that if they're at all suspicious about a call they receive, hang up and phone the organisation the person is purporting to represent to check their authenticity.
"Ideally, make the call from another telephone, so you can be sure the original caller has not remained on the line. Never be pressured into a transaction over the phone."
Further information is available at www.nidirect.gov.uk/scamwiseni or to report a suspicious call, contact Action Fraud via their website, www.actionfraud.police.uk, or by phoning 0300 123 2040.