VIDEO: Federal Way fire and police investigators are looking into what caused an American Medical Response ambulance to be destroyed by fire early Saturday morning. South King firefighters said they were called to the 34800 block of 9th Avenue South. Two AMR employees and a patient were inside the ambulance when the fire started, a spokesperson for the company said. An AMR caregiver was taken to the hospital, evaluated and later released. Firefighters said they put out the fire around 3 a.m. It is not yet known what caused the fire. The investigation remains ongoing.