iran ordered that the reason the plane crashed be found out. a day after the crash, people at the location had found both the flight's cockpit voice recorder, which records sounds in the cockpit, and the flight data recorder, which records what the plane does. iran's transport ministry said that the investigation will be made up of several groups of people that study different parts of. the iran civil aviation organization will be in charge. the flight data recorder and cockpit voice recorder were both taken to tehran as part of the investigation.