"We are co-operating fully with the Police & their ongoing investigations. We'd like to thank guests for their patience."
Detective Inspector Andy Greaves said: "I'm keen to hear from anyone who saw what happened or who has video footage of this assault.
"The two groups of people were close to the exit inside the park on the bridge when the assault took place.
"We're still trying to establish what has happened, however I'd like to stress that this incident is not being treated as terrorism-related at the current time.
"Enquiries are ongoing to locate all those believed to have been involved. Officers will remain in the area for some time this evening and I'd like to thank Thorpe Park for their assistance and co-operation with our investigation".
