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.
Messages seen by reporters included a photo appearing to show a handgun on the lap of someone sitting in the driver’s seat of a car. The sender described it as a Glock 19 pistol, saying it was real. The student also shared details about other firearms, and sent a close-up image of the Glock’s model number.
In a Line group chat with 254 members, named “Montfort Dark Side,” students discussed a possible shooting the following day, including possible times, locations on campus and recording video of the attack. Some participants appeared to question whether the threat was genuine, while others encouraged it or treated it as a joke.
The messages alarmed parents, some of whom contacted the school and went to collect their children. The school said it coordinated with Mae Ping Police Station, which sent about 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.
