“He had been planning this crime since last summer”, Bavarian investigator Robert Heimberger told a press conference.
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Thomas Steinkraus-Koch, spokesman for the Munich prosecutor’s office, told the briefing there was no evidence of any political motivation.
The teenage gunman who shot nine people dead in Munich had been planning his attack for a year, according to German authorities.
“Our thoughts also go out to the numerous injured people – may they recover quickly and completely – they will receive all the support they need”.
The Afghan youth reportedly went to police voluntarily on Friday after the shooting by Sonboly.
President of the Bavarian state criminal police office, Rober Heimberger, said a book was found in his home titled “Rampage in My Mind – Why Students Kill”.
Thirty-five others were injured, 11 of them seriously, according to a new toll released by Munich police Sunday.
He said it was unclear when he bought the gun, or how he paid for it, adding that the parents of the gunman remained in shock and were not able to be interviewed.
The attacker set up a fake Facebook account in May, stealing the profile of a real user and sending out invitations to lure people to the fast-food restaurant.
“He completely occupied himself with this act of rampage”, Heimberger said.
In the run-up to his attack, he had visited the site of a school shooting in Winnenden to take photographs, and he was also an avid player of first-person shoot-em-up video games.
The blast is the third incident to hit the southern German state of Bavaria in a week, after nine were killed in a shooting rampage in Munich and several were wounded in an axe attack on a train.
Investigators are now discounting previous statements that the shooter had researched the massacre in Norway by Anders Breivik, which took place on the same day in 2011.
Mr Heimberger said it appears “very likely” that the suspect purchased the weapon online through the so-called “darknet”. Turkey’s Foreign Ministry said three of the victims were also Turkish nationals.
“How can it be that an unstable, or possibly even mentally ill, 18-year-old comes into possession of a firearm?” he asked.
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No motive has yet been established for the attack but police have ruled out any connection to recent Islamist militant attacks in Germany and France.
