Here is the full statement issued by PwC in London in response to the Luxembourg Leaks published by ICIJ: 

PwC takes the improper disclosure of any confidential information extremely seriously. As soon as it became aware that documents had been illegally taken from its offices in Luxembourg, PwC undertook a full investigation that quickly led to the individual who we believe took the documents. The matter was immediately reported to the relevant judicial authorities in Luxembourg whose enquiries into the matter are continuing. At the time of the disclosure of the documents, the individual had already left PwC's employment.

Since these documents were taken, PwC Luxembourg has conducted a thorough review of its security systems and processes, and continually enhances the security of its systems to match current best practice.

PwC provides independent professional advice to clients on the issues that are important to them in running their businesses including a wide range of tax issues. This can include advice on the taxation of potential business transactions in a particular country. We also assist our clients with the preparation of tax returns and with discussions with tax authorities. 

All our advice and assistance is given in accordance with applicable local, European and international tax laws and agreements and is guided by the PwC Global Tax Code of Conduct which has been in place since 2005. Our global tax code sets out guidance for our tax professionals around the world on a range of issues, including taking into consideration how any tax decisions will be viewed by wider stakeholders. 

Our client relationships are governed by strict confidentiality; we cannot comment on individual cases.