Salafism is a part of the Sunni branch of Islam which is a revival of original Islamic ideals. Salafists strive to live exclusively according to the Quran. According to German authorities, Salafism is incompatible with the principles codified in the Constitution of Germany, in particular democracy, the rule of law and a political order based on human rights. According to the German security service, the Salafist movement attracts rising numbers. In 2011 there were an estimated 3800 Salafists in Germany, which rose to 10300 in September 2017. According to head of security office Hans-Georg Maaßen, the Salafist scene in Germany is not dominated by any one single individual, but instead a great many persons have to be monitored.