MUNICH (AP) — The 18-year-old gunman who opened fire at a crowded Munich shopping mall and fast-food restaurant, killing nine people and wounding 16 others before killing himself, was obsessed with mass shootings, police said Saturday.Investigators searched the unnamed German-Iranian man's home overnight and found a considerable amount of literature about mass killings, including a book titled "Rampage in Head: Why Students Kill," but no evidence that he was linked to [...]