"We suspect that this boy aged 16 years could have been aware of the act," police said in a statement yesterday following Friday's shooting spree after which the 18-year-old German-Iranian attacker, David Ali Sonboly, killed himself.
The arrest is the first in the investigation.
The teenager "handed himself in to police shortly after the killing spree and had been questioned on his relationship with the perpetrator," the statement added.
But officers had "uncovered contradictions in his statements" and he was now being held in custody for withholding information about a crime.
The suspected posting related to "a meeting in a cinema complex near to Munich central station", police added.
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.
There was no evidence, however, that any of the people who had interacted with Sonboly via the fake account had responded to the invitation in which he offered meals and drinks.
You’ve reached your limit of {{free_limit}} free articles this month.
Subscribe now for unlimited access.
Already subscribed? Log in
Subscribe to read the full story →
Smart Quarterly
₹900
3 Months
₹300/Month
Smart Essential
₹2,700
1 Year
₹225/Month
Super Saver
₹3,900
2 Years
₹162/Month
Renews automatically, cancel anytime
Here’s what’s included in our digital subscription plans
Exclusive premium stories online
Over 30 premium stories daily, handpicked by our editors


Complimentary Access to The New York Times
News, Games, Cooking, Audio, Wirecutter & The Athletic
Business Standard Epaper
Digital replica of our daily newspaper — with options to read, save, and share


Curated Newsletters
Insights on markets, finance, politics, tech, and more delivered to your inbox
Market Analysis & Investment Insights
In-depth market analysis & insights with access to The Smart Investor


Archives
Repository of articles and publications dating back to 1997
Ad-free Reading
Uninterrupted reading experience with no advertisements


Seamless Access Across All Devices
Access Business Standard across devices — mobile, tablet, or PC, via web or app
)