Overview

• A photo timestamped minutes before the shooting was posted from a school restroom, indicating the attacker shared a final glimpse of his plan on social media.
• Police recovered detailed handwritten notes, a farewell letter, a video apology and a non-functional pipe bomb during searches of the shooter’s home and digital devices.
• Authorities confirmed the 21-year-old legally owned a shotgun and a Glock handgun after passing mandatory psychological evaluations and practicing at a local shooting club.
• Investigators are examining his online interests in first-person shooter games and possible Columbine references to uncover a motive and are probing whether he had assistance.
• Austria has declared three days of national mourning for the 10 victims and leaders around the world have sent messages of condolence.