In 2007, Bradley Birkenfeld, a Geneva-based employee who worked in the bank's North American wealth management business, claimed that UBS's dealings with American clients violated an agreement between the bank and the U.S. Internal Revenue Service.[221] He subsequently complained to UBS compliance officials about the bank's "unfair and deceptive business practices", which included sponsoring events like yacht races and art festivals in the United States to attract wealthy people as potential clients.[222] UBS was charged by the U.S. Federal Bureau of Investigation and ordered it to cease providing cross-border private banking services to US-domiciled clients through its non-US regulated units as of July 2008.[223] In 2012, the German government saw to it that UBS Deutschland AG came under investigation by prosecutors in Mannheim, Germany, after a tax probe revealed suspicious funds transfers from Germany to Switzerland allegedly facilitated by the bank's Frankfurt office.[224] UBS Deutschland's Frankfurt office was raided by tax investigators in May 2012, and over 100,000 computer files and records were seized for evidence.