An 11-year-old girl has died after going missing at a water sports and activity park.
Police were called to the lake at Liquid Leisure Windsor in Datchet, Berkshire at 3.55pm local time on Saturday after the child got into difficulty.
She was found more than an hour later by emergency services and was rushed to hospital, but later died.
Members of the public who went into the water to look for her have been praised for their bravery.
Thames Valley Police said her death is being treated as unexplained and an investigation has been launched.
Supt Michael Greenwood said: “This has been an extremely traumatic and upsetting incident for all involved.”
Several members of the public got into the lake shortly after she got into difficulty “but were unable to locate her”, he said.
“I would like to commend them for their courage and bravery,” he added.
The Royal Berkshire Fire and Rescue Service, Buckinghamshire Fire and Rescue Service, Surrey Fire and Rescue Service and South Central Ambulance Service joined police officers at the site.
Supt Greenwood, the local policing area commander for Windsor and Maidenhead, offered his “sincere condolences” and requested that the privacy of the girl’s family be “respected”.
He said: “We are in the early stages of investigating this incident to understand the full circumstances.”
Liquid Leisure Windsor describes itself as being home to “Europe’s largest aqua park” with outdoor activities including wakeboarding, a floating obstacle course on the lake, open water swimming and boat rides.
In a statement on its Facebook page, the company said it would be closed on Sunday.
It said its thoughts were with all those affected “by this desperately tragic and upsetting incident”.