Two six-year-old girls have been sexually assaulted while they were on a family fun day at Legoland.
Police are now hunting a man in his late teens or early 20s in relation to the attack at the theme park in Windsor.
The incident happened between 12.15pm and 12.30 on Thursday, at the Castaway Camp playground in the Pirate Shores.
Police have described the offender as white, 5ft 8ins tall wearing dark slim trousers and a dark T-shirt and trainers.
He was known know to the young girls.
Witnesses asked to email police on URN615@thamesvalley.pnn.police.uk. Anyone with information can call 101 or the charity Crimestoppers anonymously on 0800 555 111.