The shooting happened at the Debsirin Nonthaburi School in Nonthaburi province northwest of the national capital, Royal Thai Police spokesperson Trairong Piwpan told The Associated Press. A witness told reporters that students hid inside a classroom while they heard gunshots from another building before police officers knocked on the door and cleared a way for them to leave the building. About an hour after the shooting, people stood outside the school comforting one another and police and first responders walked around inside the school. He said three teachers and three students were killed. Deputy Interior Minister Polapee Suwunchwee told reporters at the scene that five teachers died and that the shooter killed his two grandparents at home before going to the school.