Shooter planned rampage for a year

The teenager behind Friday’s deadly shooting rampage in Munich was a withdrawn loner obsessed with playing “killer” video games in his bedroom, a victim of bullying who suffered from panic attacks set off by contacts with other people, investigators said Sunday, adding that he had planned the attack for a year.

Law enforcement officials piecing together a portrait of the 18-year-old shooter, a German-Iranian, said he was seeing a doctor up to last month for treatment of depression and psychiatric problems that began in 2015 with in-patient hospital care followed by outpatient visits.

Late Sunday police said they had taken in for questioning a16-year-old friend of the shooter who might have known of the attack plan.