BANG KRUAI DISTRICT, Thailand — At least one teacher was killed and four other people injured by a student who opened fire at a school in Thailand on Friday before killing himself, authorities said.

Lt. Col. Dechrapee Kongdee, the Nonthaburi provincial police commander, confirmed the casualties to Reuters and said the suspected gunman had died by 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 there were firecrackers 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.