A children's summer camp has been shut down after a man was arrested on suspicion of possessing indecent images of minors, police said.
LL Camps, a private holiday camp based in Hertfordshire which describes itself as the "first and only American camp in the UK", announced its closure on Thursday.
In a joint statement, Hertfordshire County Council and Hertfordshire police confirmed LL Camps had been suspended by education watchdog Ofsted, adding: "A 27-year-old man from Borehamwood has been arrested on suspicion of possession of indecent images of children and has been bailed until September.
"Hertfordshire Constabulary, Hertfordshire County Council and Ofsted are working together on this issue and the safety and welfare of children is the top priority."
Addressing the concerns of parents whose children attended the camp, it said that "swift action will be taken should the investigation reveal that any child has been affected".
An Ofsted spokesman said: "We can confirm we have suspended the registrations of these early years settings while investigations are carried out.
"It would be inappropriate to comment further while investigations are ongoing."
Parents have been told of the closure of the camp in St Margaret's School, Bushey.
A post on the camp's Facebook page reads: "We regret to inform you that LL Camps will be closed for the summer with immediate effect.
"We understand that this will cause significant inconvenience to you and we are exceptionally apologetic for this.
"We cannot disclose any further information at this time and we appreciate your patience in this matter."
The children's activities camp was founded four years ago, running throughout the school holidays. This summer's camp was due to finish on August 28.