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A Thai teenager killed at least five people and himself at a school outside Bangkok on Friday after fatally shooting his grandparents, police said, in the Southeast Asian nation’s worst mass killing since 2022.

Police said the shooter, who was 14 years old, fired at least 26 bullets, and was found with 34 additional ammunition rounds. The gun had belonged to his grandfather, police said.

Students streamed out of the Debsirin Nonthaburi School, on the capital’s northwestern outskirts, as the wounded were loaded on to ambulances and teachers hugged each other and cried. In photos circulated by emergency workers, one person is seen lying down on a stretcher outside an ambulance, while another is attended to by a medic.

Police said 23 people were wounded in the incident, the latest in a succession of high-profile shootings in recent years in Thailand, which has by far the largest number of guns in civilian possession in Southeast Asia, and among the most per capita in Asia, according to a 2017 estimate by the Small Arms Survey.