Alexander Eisvogel, of Germany’s domestic intelligence agency, said in comments published Sunday the attacks on a Norwegian government building and a youth camp could serve as “a blueprint for copycats.”

Eisvogel, vice president of Germany’s Office for the Protection of the Constitution, told Der Spiegel the attacks posed a “new form of xenophobia that is not racially, but culturally and ideologically” motivated. He said they were “meticulously planned” to avoid officials’ detection.

Far-right extremist Anders Breivik wrote a 1,500-page manifesto describing the attacks as the opening of a new crusade to purge Europe of Muslims and “cultural Marxists.”