CHIANG MAI — 11 August 2026, Montfort College in Chiang Mai tightened security after a student allegedly posted a threat in a Line chat group to carry out a shooting at the school.
A series of messages were shared with reporters regarding the incident. Students’ names have been anonymized, and replaced by pseudonyms.
Among the messages was a conversation in which a student shared a photo showing a handgun on the lap of a person in the driver’s seat of a car.
Rocket: Is it real?
Lightbulb: Real 9mm pistol. Brand Glock 19.
Lightbulb continued in the message thread describing various types of firearms and a close-up image of the handgun’s model number.
In a popular Line group chat called “Montford Dark Side” students openly discussed carrying out a shooting.
Tree: Are you guys joking?
Tree: Go call lots of police, because my house sells guns.
Cat: Go call the police, because my house sells kratom.
Cat: @Tree
Tree: Who are you?
Cat: Are you really going to shoot tomorrow? I want to see it on the news. And you take out the whole group, okay?
Tree: Okay. Let’s do it.
Cat: 10 o’clock sharp, right?
Tree: The head chef, the eldest son.
Cat: [censored], the eldest son, lol.
Purple hat: This type of person is all talk.
Dog: Okay, where will you start shooting?
Cat: If you tell, you’re an idiot. Go shoot building by building first. I’ll record the video.
Tree (reply to Dog): I’ll start shooting from the student affair office to the electric shop.
Dog: Then I’ll stay in the building. Don’t come up, okay? I’ll record a video.
The messages caused alarm among parents, some of whom contacted the school and travelled there to collect their children. The school said it had coordinated with Mae Ping Police Station, which sent around 20 officers to inspect the campus on 10 August.
“Anyone with children at Montford High School right now, the situation is not good.
senior high students are planning to shoot each other in the school.
My child is not going to school anymore. And some parents are starting to pick their children up.”
A teacher at the school said the students responsible had been identified and admitted to sending the messages “out of mischief” and in imitation of an online trend, without expecting it to spread so widely.
On 11 August, police and school staff conducted detailed checks of students, teachers and other personnel at the entrance before they entered the campus. Officers also inspected classrooms and spoke to students about safety precautions, recognising warning signs, taking shelter and responding if violence occurs.
The school said the situation has returned to normal. It added that parents concerned for their children’s safety may allow them to take leave from school when necessary.
In an initial notice to parents, the school said its student-affairs department had coordinated with Mae Ping police investigators, who would help monitor security while the messages were being circulated. It asked parents, students and staff to cooperate in safeguarding the school community.
