A 16-year-old friend of the gunman who shot dead nine people on a murderous rampage in Munich has been arrested by police.
The boy reportedly handed himself to police after the deadly attack on Friday evening which shocked the world.
It is understood he might have known of the plans by the 18-year-old German-Iranian, identified in reports as Ali David Sonboly.
German authorities said the teenager was a withdrawn loner who had been plotting the attack for up to a year.
Officials said he had been a victim of bullying who suffered from panic attacks set off by contact with other people.
The teenager had been seeing a doctor for treatment over a number of psychiatric problems which began in 2015 with inpatient hospital care, followed up with outpatient visits.
Officers said medication for his problems had been found his room. Toxicological and autopsy results are still not available, so it is not yet clear whether he was taking the medicine when he embarked on his shooting spree on Friday.
Investigators said the gunman had been bullied by schoolmates at least once four years ago, and had been fascinated by previous mass shootings.
None of the bullies were among his victims, however, and none of those killed were known to him.
The attack took place on the fifth anniversary of the killing of 77 people by Norwegian right-wing extremist Anders Behring Breivik, whose victims included dozens of young people.
Additional reporting by agencies
