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Incident 1489: ChatGPT Was Reportedly Used in Planning School Stabbing in Pirkkala, Finland, That Injured Three Pupils

Description: In May 2025, a 16-year-old boy stabbed three 14-year-old girls at Vähäjärvi School in Pirkkala, Finland. Same-day reporting said a manifesto attributed to the suspect claimed he used ChatGPT while planning the attack. Later court reporting said police found hundreds of pre-attack searches or queries described as involving AI, including topics related to stabbing, anatomy, school attacks, police procedures, evidence concealment, and manifestos.
Editor Notes: Timeline note: This incident occurred on 05/20/2025; the incident ID was created 05/13/2026.

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Alleged: OpenAI and AI search technology developers developed an AI system deployed by Pirkkala school stabbing suspect and OpenAI, which harmed Vähäjärvi School pupils , Vähäjärvi School community , Pirkkala school stabbing victims , Students , high school students and Educational communities.
Alleged implicated AI systems: ChatGPT and AI search technology

Incident Stats

Incident ID
1489
Report Count
13
Incident Date
2025-05-20
Editors
Daniel Atherton

Incident Reports

Reports Timeline

+6
Teen suspect stabs three in targeted school attack in Pirkkala
Prompted to Harm: Analysing the Pirkkala School Stabbing and Its Digital ManifestoAI at the Centre: Violent Extremist Exploitation in Pirkkala+1
School stabber convicted of three counts of attempted murder
Photo: This is why the Pirkkala school stabbing was interrupted – the 16-year-old prepared for his act in the toiletThe Chilling Role of ChatGPT in Mass Shootings and Other ViolenceChatGPT Gave Me Chilling Advice—as I Simulated Planning a Mass Shooting
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Teen suspect stabs three in targeted school attack in Pirkkala

Teen suspect stabs three in targeted school attack in Pirkkala

helsinkitimes.fi

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Police probe motive as three girls injured in stabbing attack at Pirkkala school

Police probe motive as three girls injured in stabbing attack at Pirkkala school

yle.fi

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Three pupils injured in Finnish school attack, police say

Three pupils injured in Finnish school attack, police say

reuters.com

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Three injured in knife attack at school in Birkala – suspect and victims are students at the school

Three injured in knife attack at school in Birkala – suspect and victims are students at the school

yle.fi

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The police are actively continuing to investigate the Pirkkala violence.

The police are actively continuing to investigate the Pirkkala violence.

poliisi.fi

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Police will present the suspect in the Pirkkala violence for arrest

Police will present the suspect in the Pirkkala violence for arrest

poliisi.fi

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Prompted to Harm: Analysing the Pirkkala School Stabbing and Its Digital Manifesto

Prompted to Harm: Analysing the Pirkkala School Stabbing and Its Digital Manifesto

gnet-research.org

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AI at the Centre: Violent Extremist Exploitation in Pirkkala

AI at the Centre: Violent Extremist Exploitation in Pirkkala

gnet-research.org

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School stabber convicted of three counts of attempted murder

School stabber convicted of three counts of attempted murder

yle.fi

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16-year-old school stabbing suspect convicted of three attempted murders

16-year-old school stabbing suspect convicted of three attempted murders

mtvuutiset.fi

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Photo: This is why the Pirkkala school stabbing was interrupted – the 16-year-old prepared for his act in the toilet

Photo: This is why the Pirkkala school stabbing was interrupted – the 16-year-old prepared for his act in the toilet

mtvuutiset.fi

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The Chilling Role of ChatGPT in Mass Shootings and Other Violence

The Chilling Role of ChatGPT in Mass Shootings and Other Violence

motherjones.com

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ChatGPT Gave Me Chilling Advice—as I Simulated Planning a Mass Shooting

ChatGPT Gave Me Chilling Advice—as I Simulated Planning a Mass Shooting

motherjones.com

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Teen suspect stabs three in targeted school attack in Pirkkala
helsinkitimes.fi · 2025

A 16-year-old boy is in custody after stabbing three female pupils at Vähäjärvi School in Pirkkala on Tuesday morning. Police confirmed the suspect was a student at the school. The victims, all fellow pupils, sustained non-life-threatening…

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Police probe motive as three girls injured in stabbing attack at Pirkkala school
yle.fi · 2025

Three pupils were injured in a stabbing incident at Vähäjärvi School in Tampere's Pirkkala region on Tuesday morning.

Local police were alerted to reports of a violent incident at the school at 10.42am. The suspected perpetrator, who police…

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Three pupils injured in Finnish school attack, police say
reuters.com · 2025

HELSINKI, May 20 (Reuters) - Three pupils were injured in an attack at a school in southern Finland on Tuesday and a fellow student suspected of carrying out the assault has been apprehended, police said.

The attacker used a bladed weapon, …

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Three injured in knife attack at school in Birkala – suspect and victims are students at the school
yle.fi · 2025
AI Translated

At least three people have been injured in a stabbing attack at Vähäjärven koulu in Birkala.

One of the school's students has been arrested on suspicion of the attack.

The victims also attend the school and their parents have been contacted…

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The police are actively continuing to investigate the Pirkkala violence.
poliisi.fi · 2025
AI Translated

The act of violence took place yesterday, Tuesday, May 20, just before 11 a.m. The police arrested the suspect 12 minutes after the alarm was raised.

Yesterday, Tuesday, May 20, an act of violence carried out with a sharp weapon occurred at…

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Police will present the suspect in the Pirkkala violence for arrest
poliisi.fi · 2025
AI Translated

According to police information, the suspect and the victim were unknown to each other.

The preliminary investigation and interrogations have progressed as planned by the police regarding the violence at Pirkkala Vähäjärvi School on Tuesday…

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Prompted to Harm: Analysing the Pirkkala School Stabbing and Its Digital Manifesto
gnet-research.org · 2025

On 20 May 2025, a stabbing incident occurred at a school in the town of Pirkkala, southern Finland, in which three female pupils, all under the age of 15, were injured. Prior to the attack, the perpetrator -- a 16-year-old male student -- s…

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AI at the Centre: Violent Extremist Exploitation in Pirkkala
gnet-research.org · 2025

On 20 May 2025, a 16-year-old boy stabbed three of his female classmates at the Vähäjärvi school in Pirkkala, Finland. Just prior to carrying out his attack, the suspect emailed his manifesto to Iltalehti, a local newspaper. Not only did th…

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School stabber convicted of three counts of attempted murder
yle.fi · 2025

The Pirkanmaa District Court on Wednesday convicted a 16-year-old male of three counts of attempted murder in connection with the school stabbings in Pirkkala this past spring.

However, a psychiatric evaluation carried out previously found …

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16-year-old school stabbing suspect convicted of three attempted murders
mtvuutiset.fi · 2025
AI Translated

A boy stabbed three 14-year-old girls. According to the court, the boy's goal with his actions was to kill the victims and gain fame.

On Wednesday, the Pirkanmaa District Court convicted a 16-year-old boy of three attempted murders committe…

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Photo: This is why the Pirkkala school stabbing was interrupted – the 16-year-old prepared for his act in the toilet
mtvuutiset.fi · 2026
AI Translated

The high school student had planned his act for a long time. 

A 16-year-old boy was convicted of three attempted murders committed as a young person. 

In May of last year, a 16-year-old boy armed with a knife attacked three 14-year-old girl…

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The Chilling Role of ChatGPT in Mass Shootings and Other Violence
motherjones.com · 2026

In June 2025, a safety team at OpenAI grew alarmed. The company's automated review system had flagged extensive activity by a ChatGPT user describing scenarios that involved gun violence. A group of staffers debated whether law enforcement …

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ChatGPT Gave Me Chilling Advice—as I Simulated Planning a Mass Shooting
motherjones.com · 2026

On April 14, I created a free account on ChatGPT and asked for some help. It resisted me at first, but after some pushing the responses turned shocking. During a conversation lasting about 20 minutes, OpenAI's chatbot gave me extensive advi…

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A "variant" is an AI incident similar to a known case—it has the same causes, harms, and AI system. Instead of listing it separately, we group it under the first reported incident. Unlike other incidents, variants do not need to have been reported outside the AIID. Learn more from the research paper.
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