A 12-year-old girl has died after being found unresponsive at Cala Gran Holiday Park in Fleetwood at 9.40pm on Monday.
The girl, from Oldham, was treated by paramedics before being taken to Blackpool Victoria Hospital, where she died a short time later, a spokeswoman for Lancashire Police said.
Her death is currently being treated as ‘unexplained’, and a post-mortem examination is due to be carried out to establish a cause of death, she added.
Eyewitnesses said a caravan at the park was taped off by police, and officers remained at the scene throughout Tuesday.
No arrests have been made.
A spokesman for Cala Gran Holiday Park said: “Emergency services were called to the park on Monday evening to tend to a 12-year-old female guest who later passed away.
“This is a tragic incident, and our heartfelt condolences go to the girl’s family, who we have offered our support to.”