MUNICH, July 23 (Xinhua) -- German investigators have found "documents about amok-runs" during a search of the residence of the shooter, who killed 10 and injured 27 people in a shooting attack in southern German city of Munich on Friday evening.
The perpetrator of the Munich shootout has no relation to the Islamic State (IS), Munich police chief Hubertus Andrae told a press conference on Saturday, adding that the search of the room of the 18-year-old revealed that he had dealt intensively with killing spree.
The investigators assumed a connection with the attack of Norwegian Anders Behring Breivik.
"This connection is obvious," said Andrae.
On Friday, Norway marks the fifth anniversary of Breivik's rampage in 2011 that killed 77 people.
According to the findings of police, the 18-year-old German-Iranian, a Munich-born and raised student, shot nine people dead early Friday evening and then killed himself.
Most victims are adolescents or young adults. The people were killed in or in front of a fast food restaurant and in the Olympia shopping center.
According to the police, the perpetrator shot with a 9-millimeter calibre pistol that he had probably obtained illegally, while 300 cartridges were found in his backpack. However, it is still unknown where he got the gun and the money for it.
The perpetrator was not in the police register. However, he was allegedly depressed and was under psychiatric treatment, which fits with the other findings of the crime, according to the investigators.
