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The perpetrator was a student at the school and had missed his first lesson
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In the corridor of the school he encountered a student and killed him
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Auvinen moved to the lavatories, while other students who found the vicim assumed that he was unconscious from falling over as he had a bump on his head
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At the lavatories Auvien fatally shot 2 more students, prompting the school nurse to call the emergency services. After shooting and killing another student outside a lavatory he ran after the nurse shot her and killed her.
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Head teacher, Helena Kalmi was alerted to the shooting by another teacher she made all of the students and teachers get together in a room to hide inside there classrooms announcing over the PA system.
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Auvien shot his gun total 53 times in the corridors randomly.
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At this point the shooter encountered a mother of a student as she entered the school but didn't kill her. He let her go.
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He attempted to enter a classroom shooting 3 times through the barricaded door and shooting a student in the toe
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Auvien then he traveled to the schools 2nd floor finding 2 students sitting down: 1 student escaped uninjured but the other was shot and killed
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Unsuccessfully