The convoy of caravans, mobile homes and vans arrived overnight and pitched up in Lancing Manor Park off Manor Road.
Pictures from the scene show at least half a dozen vehicles and several dogs.
West Sussex County Council and Adur and Worthing Councils, which owns Lancing Manor Park, have been contacted for more information.
West Sussex County Council and Adur and Worthing Councils, which owns Lancing Manor Park, have been contacted for more information.
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