A Zip World spokesperson said: “The member of staff was dressed in fancy dress as a clown and part of Zip World’s entertainment team.
“They were discharged from hospital last night.”
They added that security measures at the site – which was closed while police investigated but has now reopened – had been increased and that the firm was working with police.
Attendees have told the BBC that they were were left waiting in the dark following the alleged assault and that police spent more than two hours searching every vehicle.
“There were a lot of people asking questions and a lot of crying,” said one woman, who did not want to identified.
She and another customer, who paid about £30 a ticket, do not know if they will be refunded.
