Concerns of Islamic fundamentalism came to the fore after 11 September 2001, especially with respect to Islamic fundamentalism among second- and third-generation Muslims in Germany - the Hamburg cell, which included Mohamed Atta, was prominent in the planning and execution of 11 September attacks. Also the various confrontations between Islamic religious law (Sharia) and the norms of German "Grundgesetz" and culture are the subject of intense debate. German critics include both liberals and Christian groups. The former claim that Islamic fundamentalism violates basic fundamental rights whereas the latter maintain that Germany is a state and society grounded in the Christian tradition.