Police have not named the attacker, but said he had dual German and Iranian nationalities and was born and raised in Munich.
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“The extent to which the arrested person is responsible for a Facebook call for a meeting in a cinema complex near the Munich main train station, the other criminal investigations are looking into”.
Some reports have identified the gunman as David Ali Sonboly, but neighbours who lived in his apartment building said he was known to everyone as Ali.
Bavarian investigator Robert Heimberger said the shooter visited the site of a previous school shooting in the German town of Winnenden and took photographs a year ago, then set about planning Friday’s attack, according to Associated Press.
There was no indication that the shooting was politically motivated or that Sonboly chose the victims due to their nationality, Mr Steinkraus-Koch said.
He was admitted to hospital for two months in 2015 to receive treatment for his psychological problems after which he continued treatment as an outpatient.
They also found links between Sonboly “and the fifth anniversary of the shootings perpetrated by Anders Behring Breivik in Norway on Friday”.
Sonboly did receive psychiatric treatment, but authorities have not given out specifics on his mental health.
“The suspect could have been suffering from a depressive disorder”, said Thomas Steinkraus-Koch, head of the Bavarian prosecutor’s office.
Heimberger said that Sonboly’s parents were still in shock from what happened and have not been able to be interviewed.
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.
They were two 14-year-old Kosovan girls, Armela Segashi and Sabina Sulaj, and their Turkish friends Can Leyla, 14 and Selcuk Kilic, 15.
Officials said photographs found on the gunman’s camera showed he had also visited the German town of Winnenden, the site of a deadly 2009 school shooting.
In the fog of the Friday attack, witnesses had reported as many as three shooters and the city’s public transit was completely shut down for hours as authorities searched the streets. The others were 20 and 45, the police chief said.
Three were from Kosovo, three from Turkey and one from Greece. Seven of those killed by Sonboly were teenagers – including two Turks, two Germans, a Hungarian, a Greek and a Kosovan – while a further 35 people were injured.
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Sonbol was “obsessed with that attack”, Heimberger said.
