But a year ago, Sonboly visited the town of Winnenden and took pictures, said Robert Heimberger, head of Bavaria’s police, according to The Associated Press.
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The gunman had also been under psychiatric care in a hospital for two months in 2015, officials said Sunday.
The Bavarian State Crime Office said Sonboly, 18, had bought the illegal pistol used in the attack on the internet’s dark net.
Documents found in his home confirmed that he suffered from mental illness, including depression and anxiety, Munich prosecutor Thomas Steinkraus-Koch said on Sunday.
German police have arrested the 16 year old Afghani boy as they suspect he knew Ali David Sonboly was planning the fatal attack and did not report it.
Police said the unstable teen had no ties to ISIS or any terrorist groups, carrying out the attack from his obsession with mass shootings.
After Friday’s killings, it emerged that Sonboly set up a fake Facebook account in May, stealing the profile of a real user and sending out invitations to lure people to a McDonald’s restaurant.
WhatsApp records revealed that the 16-year-old Afghan was aware that the shooter, a German Iranian, was in possession of a Glock 17 handgun.
Senior German officials have called for further controls on the sale of guns after Friday’s deadly shooting in Munich that claimed the lives of nine people and the gunman.
The investigations will have to show to what extent, if any, he was involved in a Facebook post inviting people to meet at a cinema complex near the main railway station in Munich.
Bavaria’s top security official has now urged a constitutional change to allow the country’s military to be deployed in support of police during attacks.
Sonboly was said to be a keen player of “first-person shooter” video games.
Six of the nine victims had a non-German heritage, police said earlier on Sunday. A 20-year-old and a 45-year-old were also killed. Most of the casualties were young people aged 15 to 21, Bavarian public television said.
According to German authorities, the German-Iranian teenager did extensive research on mass shootings before carrying out the attack.
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“That is not true”, Heimberger said answering the question if Breivik’s “Manifesto” had been discovered during the search at the gunman apartment.
