A Crawley couple in their 70s were conned out of hundreds of pounds after handing their bank details over to men claiming to be police.
Now officers are hoping to trace these suspects involved in the fraud.
Detectives have footage of men using a bank card which was conned out of the couple.
On May 7 shortly before 1pm the couple, from Hyde Drive in Ifield, Crawley, received a call on their landline from a man who claimed to be an officer from Hammersmith Police Station.
The officer told the victim they had arrested someone in London for an alleged card fraud.
The victim thought he was put through to his banks to cancel the cards and then arranged for them to be picked up by the "police officer".
During this time he gave his pin numbers to who he believed to the bank.
The cards were then collected by taxi but the man from Crawley soon became suspicious and contacted police.
Detectives have traced the cards being taken by taxi to the Ibis Hotel in Romford Road in the Stratford area of London.
The cards were then used just five minutes later at a cash machine on Bow Road.
Two men used the cards and managed to withdraw about £350 in cash.
Detective constable Glenn Fisk said: “We believe the two men are between 18 and 25, Asian and slim.
“This type of fraud has become more common and we are asking people to remain vigilant of these criminals.
“Neither police officers or banks will ever ask for your pin number so never give it to anyone.
“If someone does call about card fraud, claiming to be the police, contact your bank immediately.
“Make sure you use a different phone to contact them as these criminals often keep the line open and will pretend to be the bank. Anyone receiving such calls should wait at least ten minutes for their line to clear and if the opportunity arises dial 1471 to obtain the caller's number.
“If you feel suspicious about a phone call, get in touch.”
Anyone with information about the crime should email firstname.lastname@example.org or call 101 quoting 1028 of 7/5.