Police have arrested 52 people in Amsterdam in connection with an email scam designed to defraud people with phony "get-rich-quick" schemes.
Police said the group was suspected of sending some 100,000 email messages to addresses in Japan and the United States.
The emails claim to be from a well-known individual or the individual's relative and promise the recipient a percentage payment from a sum of up to $20 million for help in transferring frozen funds to an accessible place.
In such scams - made infamous by West African fraudsters - once the victim is hooked, he or she is then is usually asked to put up hefty sums for air fares or other pretences.
"It is surprising that despite repeated reports about this people continue to be so naive as to take part in these proposals," the police said.
A police spokesman declined to say whether those arrested were Dutch citizens or foreign nationals.
The suspects were seized in raids on 23 locations around Amsterdam, along with a number of personal computers, mobile phones, false documents and a total of €50,000 in cash.