Four people—two men and two women—were killed Tuesday afternoon when an Australian theme-park ride malfunctioned at Dreamworld in Queensland. Two people were thrown from a raft, and another two were trapped by machinery. Witnesses reportedly ran from the ride screaming after seeing the incident. Staff at the park performed first aid until paramedics arrived at the scene. The family-friendly ride is 28-years-old and allows children as young as the age of 2 onto it. It features six chairs on an inner tube, as visitors ride through the 448-yard water course. The entire park was closed following the malfunction, and it will remain shut down in the coming days.