Munich gunman spent a year planning his attack

German authorities say the gunman who opened fire at a Munich shopping center on Friday, killing 9 people and injuring 35 more, planned the attack for a year. On Sunday, Robert Heimberger, president of the Bavarian state criminal police office, said 18-year-old David Sonboly left a manifesto on his computer. "He appears to have planned this act since last summer," Heimberger said. "He completely occupied himself with this act of rampage."

In planning his attack, Sonboly, who authorities say was "obsessed" with mass shootings, visited the site of a previous school shooting and took pictures, The Associated Press reports. In 2015, Sonboly spent two months as an inpatient at a mental care facility, where he was treated for depression and a fear of contact with other people. He killed himself after the attack.

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