David Sonboly, 18, who had a Glock pistol and more than 300 bullets, killed himself after the attack Friday at the Olympia shopping center, according to BBC.
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The arrest is the first in the investigation.
Investigators are still analyzing the 18-year-old’s computer, said Robert Heimberger, president of the Bavarian state criminal police office.
Thomas Steinkraus-Koch, senior public prosecutor in Munich, told a news conference on Monday the Afghan had been in contact with the gunman via WhatApp until shortly before the attack.
Police raided the killer’s home and found a copy of the book Why Kids Kill: Inside the Minds of School Shooters by U.S. academic Peter Langman.
Investigators said they saw an “obvious link” between the killings and white supremacist Anders Breivik’s massacre of 77 people in Norway exactly five years earlier.
GERMAN police have arrested a 16-year-old German-Afghan citizen as a “possible accomplice” to last week’s shooting spree in Munich which left nine people dead.
Bavaria’s top security official on Sunday urged a constitutional change to allow the country’s military to be able to be deployed in support of police during attacks like Friday night’s deadly rampage at a Munich mall, while Germany’s vice chancellor proposed even stricter controls on firearms. According to neighbors, a teen named Ali Sonboly lived in an apartment searched by police after the attack.
The gunman’s father saw a video of the start of his son’s rampage on social media and spoke to police as it was taking place, Mr Heimberger said, adding that the family was not yet emotionally up to questioning by police.
Some reports said he may have played a role in the Facebook post inviting people to meet at the fast food restaurant where the shooting began.
The shooting spree, in which Sonboly killed nine people before shooting himself, sent shock waves through a country on edge.
Most of the victims in Friday’s attack were foreigners, including three Turkish nationals, three people from Kosovo and a Greek man.
The casualties were mostly young, with three aged just 14 and two aged 15.
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The attacker has been identified as a 21-year-old Syrian asylum-seeker.
