A large decorative helicopter fell from the ceiling into a swimming pool below while people were in the water just after 3 p.m. Sunday.
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The mall says the injuries were minor, but one of the four people was taken to the hospital. The rest of the injured left on their own.
American Dream released a statement saying they will conduct an investigation to "ensure the park meets all safety regulations as required."
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Police say the water park was evacuated after the incident.
The water park had planned to reopen Wednesday, but now the New Jersey Department of Community Affairs has ordered the park to stay closed pending a review of the incident.
DreamWorks Water Park is located about 13 miles west of New York City in the Meadowlands Sports Complex.
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