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People in Shepway are being advised not to buy illegal cut-priced tickets for the Z008 Festival coming up in July at Port Lympne Wild Animal Park.
It's after a number were stolen from a shop in Folkestone on Friday.
Matt Dice, director of Zoo Thousand Music Festival, warned people would be turned away if they didn't have valid passes.
He feared music lovers would buy the tickets and think they were getting a bargain - only to find the doors were closed to them on the day.
He advised people to buy tickets only from official outlets.