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Police are urging the public to be careful with their bank account details after Oamaru residences were targeted by international mail fraud.
Senior Constable Graeme McPherson, of Oamaru, said a member of the public had reported receiving a letter from a Canadian address containing a cheque for $3300 and a promise for a further $75,000.
Snr Const McPherson said the scam likely involved acquiring people's credit card and bank details or deceiving people into surrendering money to free up fictional funds from overseas.
He urged people to keep their details secure and only use them on genuine, trusted internet sites.