North Wales Police are appealing for witnesses after two caravans and a car were damaged by fire at the Whitehouse Leisure Park, Towyn, on Friday November 5.
Inspector Paul McKeown said the fire started in a caravan at the site at 11.22pm and then spread to another van and a car.
He said:” There were also people who were staying in their caravans nearby and they had to be evacuated.
“We are anxious to trace anyone who may have been in the area at the time and noticed anything unusual,” he said.
Anyone with information is asked to contact North Wales Police on 101 (if in Wales) or 0845 6071001 (Welsh) 0845 6071002 (English) alternatively text 66767 or Crimestoppers Wales/Cymru on 0800555111.