Lt. Col. Dechrapee Kongdee, Nonthaburi Provincial Police Commander, confirmed ​the casualties to Reuters and said the suspected gunman ​had committed suicide. Among those injured were one teacher ⁠and three students, he said.

The incident took place in ​the Bang Kruai district of Nonthaburi province north of Bangkok. ​Police identified the perpetrator as a student.

One 18-year-old student told Reuters he initially thought firecrackers were going off or someone banging an ​object.

“I didn’t think it was a gun at first,” he ​said. “There were many shots: bang bang bang. Then it went quiet. Then ‌it started again.”

In photos circulated by emergency workers, students streamed out of the Debsirin Nonthaburi School, on the northwestern outskirts of Bangkok, as ambulances operated. In one photo, one person is ​seen lying ​down on a ⁠stretcher outside an ambulance, while another is attended to by a medic.

In the 2025 academic ​year, the school had an enrollment of ​around 3,100 ⁠students and 147 teachers, according to district authorities.

In February, a teacher died, and a student was injured in southern Thailand’s ⁠Hat Yai ​district after a gunman opened fire at a school.