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A mother is demanding answers after an ambulance caught fire with her young child inside. Sierra Dishman says her two-year-old son was being transferred from a hospital in Tulsa to Oklahoma City on Sunday when the ambulance went up in flames. Dishman said she smelled gas and urged the paramedics to pull over before the fire started on the Turner Turnpike near Sapulpa. The fire was extinguished and nobody was injured, but the cause of the blaze is still unknown. EMSA spokesman Adam Paluka says the agency is investigating the incident.