Thousands of leaked documents obtained by journalists allegedly reveal banks were used by criminals to move dirty money around the globe.
Information on more than $2 trillion dollars worth of transactions have been exposed and reportedly show how banking officials allowed fraudsters to move money between international accounts, often in the knowledge that the funds were being used criminally.
More than 2500 documents are being scoured through by the International Consortium of Investigative Journalists.
One of their senior reporters is Will Fitzgibbon, who speaks to Corin Dann from Washington DC.
