Rickard Andersson, the perpetrator of the mass murder on 4 February at the Riskbergska School in the Swedish Eörebro, traded alone and was under the influence of amphetamines. This is evident from the final report of the police investigation presented on Friday. Eleven people, including Andersson themselves, died in the attack. He is said to have been driven by a series of rejections and disappointments for committing his act, including a failed mathematics study.
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