A teenager arrested in connection with the deadly Munich shooting may have known about the attack before it happened, officials have said.
The 16-year-old Afghan appeared to have met with the gunman at the mall where the shooting took place before the attack and knew he had a pistol, police said.
Investigators said the two teenagers met last year as in-patients at a psychiatric ward, with both being treated for online game addictions, among other things.
A spokesman for the German Interior Ministry said there could be a link between video games and the shooting and that there should be a discussion about "violent" video games.
Nine people were killed when a gunman opened fire at a shopping centre in Munich - seven of whom were reportedly teenagers.
A gunman who killed nine people and at a Munich shopping centre was German-born and had no links with Islamic State, authorities say.