Officers were called to a large gathering at an industrial premises just before 9pm on Saturday night, where 200 to 300 vehicles were found to be in attendance.
Det Supt Angus Moir from Suffolk Police said: "Enquiries are ongoing to establish the circumstances leading up to the event and where we can prevent, disrupt or stop a rave taking place, we will do everything within our power to do this in order to minimise the impact on local communities.
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