Munich killer had interest in 'frenzied attacks' and had article entitled 'Why do students kill?'

The teenage gunman who killed nine people then himself in Munich was obsessed with "frenzied" attacks including mass shootings and had an article entitled "Why do students kill?" at his home. Police in Munich have searched the home of German-Iranian citizen David Ali Sonboly who is suspected of gunning down innocent civilians outside a shopping mall.

Police officials have said that the suspected killer had no known links to the Islamic State (Isis) but they had found documentation, including electronic data, that was linked to "frenzied" attacks. The latest developments seem to indicate the youth did not have links to any ideology or terrorist group.

The massacre, on Friday 22 July at the Olympia shopping mall also left 10 dead, including the gunman in a suspected suicide, and 27 people injured, including children. Of the injured, 10 remain in critical condition.

At a press conference in Munich, police chiefs said that all of the dead come from the city and that at least six of the dead (including the gunman) were teenagers. Among the victims one child is aged 13, and three of the victims are believed to have been from Kosovo.

Munich's Police President Hubertus Andrae said officers searched the flat Sonboly shared with his parents finding "documentation on frenzied attacks" and that there was no link to immigrants or immigration. During a press conference, the officials said that the shooter had no previous criminal record and they believe he may have had a "mental disorder" and had received treatment for depression.

Police investigator Robert Heimberger said officers found newspaper clippings documenting attacks including an article entitled, "Why do students kill?" He added that the Sonboly was armed with 9mm Glock pistol, that had its serial number removed, and had 300 rounds in his rucksack.

He added that the gunman, who was born in Munich, appeared to have hacked a Facebook account and sent a message urging people to come to the McDonald's for free food.

After the shootings inside and outside the crowded Munich Olympia Shopping Centre the teenager was heard to yell "I was bullied for seven years," in an exchange with a bystander on the roof of a nearby car park.

Police seemed to confirm that Sonboly had been the victim of bullying, as Munich prosecutor Thomas Steinkraus-Koch said he had been the "victim" of crime in 2010 and 2012. In 2012 Steinkraus-Koch said he had been "damaged" by three youth offenders. It is understood that Sonboly's father works as a taxi driver and his mother works in the German department store Karstadt.