 In the days before the attack he discussed ignorance by others, the lack of purpose in his life, mass shootings and suicide on social media.Roslyakov was in a number of online communities dedicated to serial killers.Surveillance footage of the incident shows Roslyakov wearing black trousers and a white T-shirt emblazoned with the Russian word "НЕНАВИСТЬ" (hatred) as he carries an eight-shot 12 gauge Hatsan Escort Aimguard pump-action shotgun with a pistol grip.