A Karl Jenkins concert has been cancelled following an extraordinary incident being declared in Llangollen.
The Welsh Ambulance Service was called to a number of reports of a medical incident at Llangollen International Eisteddfod.
It confirmed that eight patients were taken to Wrexham Maelor Hospital with flu-like symptoms.
A spokesperson for the Llangollen International Eisteddfod said it was forced to cancel the event, but it would continue on Thursday morning.
Jenkins, a Welsh musician and composer, was due to perform at the concert on Wednesday evening.
It added that the extraordinary incident related to a flu-like outbreak with multiple people coming forward with similar symptoms.
"The Llangollen International Eisteddfod takes the safety of its audience, competitors, performers and volunteers extremely seriously.
"We'd like to thank our staff, medical staff and our volunteers for their swift response this evening," it added.