Detectives investigating a scam which saw a 90-year-old woman conned in to spending £50,000 on gadgets - including an iPad and a Playstation - have released images of two men they would like to question.

The victim also bought a mobile phone and two watches in Selfridges after someone pretending to be a police officer told her to buy them during a phone call.

She bought the items in her home town of Welwyn Garden City as well as central London after the hoax call on September 23, Hertfordshire Police said.

Detectives believe the telephone used to contact the pensioner was topped up in a convenience store in Midland Road, Bedford and have released CCTV pictures of two men seen inside the shop.

Detective Constable Mark Cotte said: "The two men pictured are believed to have been in the store around the time the phone was topped up and so we would like to speak with them as they may be able to assist our investigation."

Anyone with information can contact Hertfordshire Constabulary on 101 quoting crime reference B1/14/2834 or speak to Crimestoppers anonymously on 0800 555 111.