A warning has been issued after fraudsters targeted two jewellers and a hotel in Tayside recently.
Police believe that an organised group of four men carried out the attacks and think they will try again.
The police are investigating the three incidents which took place on Wednesday, April 10.
A hotel in Perth was defrauded of a five figure sum of money and the gang made two unsuccessful attempts to gain money at the jewellers.
The first man wanted by police is male, of Asian ethnicity in his 20s, five foot nine inches tall with short dark hair and dark facial hair. He was wearing a red, white and blue jacket, jeans and dark shoes.
The second man is of black ethnicity, in his 20s and of medium build with a pot belly. He is six feet tall with short black hair and he was wearing a grey puffa jacket, white t-shirt, blue jeans and black shoes.
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The next man is of Asian ethnicity, in his 20s, tall, of slim build with short dark hair and dark facial hair plus a prominent pointy nose.
He was wearing a black North Face puffa jacket with a red top and a white Adidas t-shirt with grey Adidas jogging bottoms with a dark strip plus black Nike trainers with white markings.
The final suspect is of black ethnicity, in his 20s, five foot eight inches tall and of slim build. He was wearing dark clothing including a baseball cap, long jacket, jeans and trainers.
All four men are believed to have spoken with a London accent.
The men used a card in the crimes and it is a lime green colour with no embossed numbers and it is believed it is a poor replica of a genuine card.
It is also believed that the four men targeted a jewellers in Glasgow in February and they were successful in defrauding it out of a large sum of money.
Anyone with information regarding the crimes should call the police on 101 or email firstname.lastname@example.org or Crimestoppers anonymously on 0800 555111.