A 14-year-old boy opens fire at a secondary school outside Bangkok, after killing his grandparents at their home, Thai authorities say. Multiple outlets report that the teenager, who is a student, shoots his grandparents first using a handgun belonging to his grandfather. He then travels to Debsirin Nonthaburi School in Nonthaburi province and begins a shooting spree. Police and officials say the attack ends when the suspect dies by suicide. Reports say the teenager fired dozens of rounds; one outlet cites 26 rounds fired and others mention additional ammunition found on him. Casualty figures vary slightly between accounts, but all describe multiple deaths among school staff, including teachers and administrators, as well as students, with additional injuries. One report says at least five school staff members die and many others are wounded, while another says at least eight people die in total. The suspected gun is described as legally registered to the grandfather. Authorities say they have not established a motive and are investigating the circumstances around the attack. The event is described as among the deadliest mass killings in Thailand since 2022, with images showing first responders treating wounded people and police clearing classrooms after gunfire.