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A hammer attack and car crash have unfolded at the entrance to Dreamworld.
Two cars were involved in a chase in the Gold Coast theme park's car park about 3.20pm.
One person suffered head injuries.
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A black Holden Commodore smashed into the brick wall at the park's entrance.
This sparked a foot chase into the theme park.
A person was hit over the head with what is believed to be a hammer, police say.
Three people were taken to hospital in a stable condition.
One person has been arrested in nearby Coomera.
Police are looking for people with CCTV or other footage.
