New shocking footage from security cameras inside a school on the outskirts of Bangkok, where on Friday morning (August 7) a 14-year-old student opened fire and killed five teachers; earlier, according to authorities, he had murdered his grandparents at their home, has come to light. More than 20 people were injured in the armed attack, 10 of whom are in critical condition. The death toll rose to nine today after a 12-year-old girl succumbed to her injuries, police announced.

According to BBC reports, the 14-year-old’s main targets were the school’s teachers, as there are no students among the victims. The armed attack lasted about an hour before the teenager took his own life by shooting himself. He was taken to the hospital with injuries but died on the way.

READ ALSO: Massacre at a school in Thailand: 14-year-old killed his grandparents before the deadly attack (VIDEO)

In the video from the school’s security cameras, the juvenile suspect is seen leaving a classroom while gunshots are heard. He then walks down the school hallway, armed, and wreaks havoc by shooting at people. Finally, he is seen running with the gun in his hand before disappearing.

GRAPHIC: A 14-year-old killed 5 teachers and wounded over 30 at a school in Bang Kruai, Thailand. He shot his grandparents at home beforehand, then turned the gun on himself. pic.twitter.com/9YYd49CwXn

— Polymarket Intel (@PolymarketIntel) August 7, 2026

The attack took place shortly after 10 a.m. on Friday, local time, at Debsirin Nonthaburi School, which is located in a large urban, residential, and commercial area north of Bangkok.

He first killed his grandparents at home 

Investigations by authorities revealed that the 14-year-old lived with his grandparents, who were found dead in their home. Authorities believe the student killed them before going to school and opening fire on the teachers.

The 9-millimeter pistol he used belonged to his grandfather, according to police. According to the same reports, at least 34 additional rounds of ammunition were found in the 14-year-old’s possession.

DEADLY SCHOOL SHOOTING IN THAILAND

A 14-year-old student opened fire at Debsirin Nonthaburi School near Bangkok

. Police say he killed his grandparents before entering the school and firing more than 26 rounds

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. At least 8 people were killed #กราดยิง #This_And_That #BreakingNews #ThepSirin pic.twitter.com/WdUgckEz8i

— GlobeUpdate (@Globupdate) August 7, 2026

So far, the motive behind the armed attack remains unknown, and authorities are continuing their investigation to determine what led the student to carry out the massacre.

Source: Protothema.gr