Nineteen people arrested after computer hackers swiped up to £6m from online bank accounts in Britain are being quizzed by police.
Millions of pounds were taken in just three months by a hi-tech gang.
They used a virus known as "zeus" to infect computers and capture the passwords and other sensitive details of banking customers.
Their money was then transferred into bogus accounts created by the crooks to help them launder it.
It is not yet known which banks are affected.
Detective Chief Inspector Terry Wilson, of the Metropolitan Police, said the amount of money stolen is likely to "increase considerably" as the investigation continues.
He said: "We believe we have disrupted a highly organised criminal network, which has used sophisticated methods to siphon large amounts of cash from many innocent people's accounts.
The officer said banks have had to repay the stolen money "at considerable cost to the economy".
"Online banking customers must make sure their security systems are up to date and be alert to any unusual or additional security features requested which is at variance with their normal log-on experience," DCI Wilson continued.
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