The youngster, who has not yet been officially identified, had gone missing after entering a pond at Liquid Leisure near Datchet in Berkshire on Saturday afternoon. The girl’s death is being treated as unexplained and an investigation has been launched. Police were called at about 4pm to reports of a young woman in difficulty at the water park. About an hour later the young woman was found and taken to Wexham Park Hospital where she was pronounced dead. The girl’s family have been informed, Thames Valley Police said. Supt Michael Greenwood, local policing commander for Windsor and Maidenhead, said: “This has been an extremely traumatic and upsetting incident for all involved.” “I know a number of members of the public went into the lake shortly after the girl got into difficulty, but were unable to locate her. “I would like to congratulate them for their courage and bravery.” Members of the public were asked to shout the girl’s name and staff asked customers for goggles to look for her underwater, according to witnesses. Officers worked with Royal Berkshire Fire and Rescue Service, Buckinghamshire Fire and Rescue Service, Surrey Fire and Rescue Service and South Central Ambulance Service and an extensive investigation was launched for the girl with support from the National Police Aviation Service . Thames Valley Ambulance said a helicopter was dispatched to provide advanced intensive care. Subscribe to First Edition, our free daily newsletter – every morning at 7am. BST A witness, who was at the park with her children, told Sky News the girl was seen going under the water and “didn’t come back up”. He added: “At that point the lifeguards came running. “He was with a group for a girl’s birthday.”