Antoine Deltour (28) was charged with leaking confidential documents which indicated that accounting firm, Price Waterhouse Coopers (PwC) assisted international corporations setting up complicated tax avoidance systems in Luxembourg.

He has admitted that he took confidential files from PwC's offices while working for the company in Luxembourg - but he has told the Paris-based newspaper Liberation that he did not intend on leaking the documents when he took them.

The Frenchman worked for PwC Luxembourg between 2008 and 2010. He says that during his final days with the company he came across the advanced tax agreements. Shocked to find the documents, he decided to make a copy with no particular intention to do anything with them. 

After leaving the company he contacted some NGOs about the documents that he had found, but this didn't amount to anything.

In 2012 he was contacted by a French journalist - this lead to a investigation which was documented on a programme on French TV.

Video produced by the ICIJ in partnership with the Pulitzer Center

PwC launched its own internal investigation into the leaking of documents in 2012.

Mr Deltour was taken into custody last Friday - he was charged with theft, and exposing trade secrets. He also faced a charge of money laundering. He was later released. 

Mr Deltour says that he is not the only source of the leaks which helped the International Consortium of Investigative Journalists (ICIJ) put together its 'LuxLeaks' story.

The project was a collaboration between over 80 journalists from 26 countries. The findings have been published in newspapers around the world, including The Irish Times and The Guardian.