French police are investigating the death of a 14-year-old Spanish girl who lost consciousness while riding a roller coaster at Disneyland Paris, park officials said Tuesday. The cause of the girl's death remained unclear. A preliminary inspection of the Rock'n'Roller Coaster ride found no malfunctions with the machinery, Disneyland spokesman Pieter Boterman said. The girl boarded the ride Monday at the theme park in Marne-la-Vallée east of the French capital, and when the ride stopped, her friends found her unconscious, Boterman said. Medical teams at the theme park tried to revive her, but by the time the ambulance arrived, the girl had died, he said. Police opened an investigation, and an autopsy was planned for Tuesday, he said.