The perpetrator of the Munich attack, Ali David Sonboly, was a racist with a far-right worldview. He saw it as mark of honour that his date of birth, 20 April 1998, was on Hitler's birthday. The Franfurter Allgemeine Zeitung [German Establishment newspaper] has learned this from security sources. Corresponding statements about his enthusiasm for Adolf Hitler also come from his closest friends and family. He is also said to have been proud of the fact that he was an Iranian and German Aryan. Originally Iran was considered the home of the Aryans. By constrast, Sonboly hated Turks and Arabs. He nurtured a "feeling of superiority" towards them.
The investigators are therefore tracking the hypothesis that Sonboly deliberately killed people of foreign origin in his action. All nine of his victims had an immigrant background, six were youths between 14 and 17, two were young adults aged betwee 19 and 20. Three youths were of Turkish origin, a 45-year-old Turkish woman was also killed. Three other youths - a boy and two girls - were Albanians.Source