Members of a Nigerian fraud syndicate who conned Hong Kong people in a bogus letter and fax scam may now be in the territory posing as Nigerian government bank officials. The head of security at the Central Bank of Nigeria yesterday issued an alert to would-be business partners on the lookout for a quick profit. His renewed warning comes after scores of businessmen received letters and faxes from the fraudsters, who claimed to be bank officials, offering millions of dollars in return for their bank details. The flood of letters appeared to have dropped from its peak in 1993-94 after warnings, but Nigerian officials fear that the fraudsters have adopted more direct tactics. Bank chiefs placed a warning advertisement in the South China Morning Post yesterday as worries about direct approaches increased. Sam Inegbenosun, the bank's director of security services in the Nigerian capital, Lagos, said: 'We believe they have a new method whereby people from the syndicate target a country, visit it and tell people there that they are delegates or officials from the Central Bank of Nigeria. 'But we must reiterate, we have not sent anybody out to meet anybody. They used to invite people to come to Nigeria but now they are coming to carry out the fraud in overseas countries in person,' he said. The scam first surfaced in 1993, when would-be 'partners' began receiving unsolicited letters from so-called bank officials who claimed to be part of a consortium who had creamed off millions from overpriced foreign investment deals. All they needed, the fraudulent letters claimed, was a bank account in which to place the funds. Those who co-operated had tens of thousands of dollars funnelled out of their accounts. In some cases, Hong Kong businessmen who took up the offer to travel to Nigeria to fix the deal were threatened into signing documents by syndicate heavies. Mr Inegbenosun said: 'We are still getting inquiries from people in Hong Kong asking for this official and that official and contract number this and that - but they simply don't exist. 'They are not defrauding the bank, they are defrauding the individuals they deal with. The bank has nothing to lose except our name.'