Northern Ireland's tourist industry is being targeted by fraudsters, the police have said.
Fraudsters have been targeting hotels and guesthouses
The fraud squad has been warning the public to beware of various lottery and internet scams, but now accommodation providers are being targeted.
Fraudsters have been negotiating prices, sending a cheque for a larger amount and then asking the business to reimburse them in a money transfer.
The cheque then turns out to be stolen or altered, police said.
They say many people are still receiving letters and telephone calls to their home or business telling them they have won a large amount of money via the Spanish or Canadian lottery.
To release the money they are told they should pay a small sum to "cover local taxes".
Account details are being requested in another type of scam which claims to be from an "overseas" government official or solicitor acting on behalf of a deceased person with no known living relatives within that country.
The scam says "millions of dollars" can be moved out of the country to the bank account of an individual here.
However, before the funds can be accessed the individual must forward a sum of money in order for the process to commence.
Police have urged people to be vigilant and use caution before disclosing personal bank details or sending money to unknown persons as a result of a letter, telephone call or internet booking.
Fraud Squad Officers are willing to advise any person who thinks they may have been the victims of fraud. They can be contacted at Strandtown station on 028 90650222.