Real estate is the preferred means for reinvesting laundered money, according to Europol.

FORBES: Europe's Crime Capitals

These account for perhaps three-quarters of all the laundered money, which means that, in one sense, money-laundering is a second-order problem.

ECONOMIST: Cleaning up dirty money

It was the gang's business-like organisation that proved their undoing, when police found spreadsheets detailing each transaction, profit and loss account ledgers and notes about laundered money.

BBC: Operation Beath