The European Commission (Commission) announced on 1 October 2008, that it has opened an in-depth investigation, under Article 88(2) of the EC Treaty, into State support measures granted to the German bank WestLB. Since the end of 2007, turmoil in financial markets affected WestLB's structured portfolio of investments, including exposure to US sub-prime real estate loans. As a result, the State of North Rhine Westphalia (NRW) provided a risk shield of €5bn on 8 February 2008, which was authorised by the Commission as temporary rescue aid on 30 April 2008. In accordance with Community Guidelines, Germany was required to notify a restructuring plan to the Commission within six months. It did so on 8 August 2008. The Commission's investigation will concentrate on: the capability of restoring the long-term viability of the bank; whether State support is limited to the minimum necessary; and whether compensatory measures should be put in place to minimise potential distortions of competition created by the aid.