According to reports, Sonboly created a fake Facebook profile under the alias Selina Akim to entice youngsters to the centre’s McDonald’s branch, before starting his shooting spree at around 6.30pm on Friday.
During a press conference on Saturday morning, Munich Police President Hubertus Andrae confirmed the Police force were looking at Ali David Sonboly's Facebook page.
Police gave a "cautious all clear" early on Saturday morning, more than seven hours after the attack began, and brought much of the city to a standstill as all public transit systems were shut down amid a massive manhunt. They said a body found near the scene was that of the shooter and he appeared to have acted alone.
Five of the attacker’s victims are adolescents – sparking fears it was a revenge attack for teens who bullied him.
Police say the motives of the attacker are still 'unclear' at the moment and it may be connected or unconnected to foreign terror groups like ISIS.
This is the third major act of violence against civilians in Western Europe in eight days. The previous attacks, in the French resort city of Nice and on a train in Bavaria near the city of Wuerzburg, were claimed by Terrorist group ISIS.