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An dispatcher said it wasn't immediately clear how far the child fell. No other injuries were reported.
Idlewild is home to mostly child-friendly rides as well as some attractions with minimum height restrictions. It wasn't immediately known which ride the child fell from.
The Pennsylvania Amusement Ride Safety Division has shut down the coaster and an investigation has been opened, said supervisor Joseph Filoromo.
The Wild Mouse, billed as a "classic roller coaster," features a steel track, while the Rollo Coaster transports riders "up and down along a wooded hillside" and swooping curves, according to the park website.
The owner of the Idlewild & Soak Zone did not immediately respond to a request for comment.
The accident follows other incidents at amusement parks and fairs this summer ? including one in Tennessee that injured three girls when their Ferris wheel bucket overturned and another in Kansas in which a 10-year-old boy was killed on a 169-foot water slide.