According to the Bangkok Post, the suspected shooter, a Grade 8 student at the school, was found dead inside the campus after the attack. Investigators believe the grandparents were killed before the school shooting, though the exact sequence of events remains under investigation. According to Thailand's Public Health Minister Pattana Promphat, the eight fatalities include five teachers, the suspected shooter and the two grandparents. Twenty-two people sustained injuries, including nine who were seriously hurt and taken to hospitals for treatment, the Bangkok Post reported. Officials said the suspected shooter had barricaded himself inside a school building before being found dead from an apparent self-inflicted gunshot wound, according to the Bangkok Post.