Police will interview members of the team accompanying the girl who died at the weekend during training for a Dartmoor challenge.
Officers from Devon and Cornwall Police will be trying to ascertain what happened during the incident which led to the death of 14-year-old Charlotte Shaw when she fell into Walla Brook.
Det Ch Insp Steve Carey said: “There is absolutely no suggestion at all of wrongdoing.
“The police are here to fully investigate the circumstances and report them to the coroner.”
Reports have suggested that Charlotte, from Torrington in Devon, who was a student at the private Edgehill College in Bideford, Devon, may have hit her head in the fall. It is believed she was found less than 200m from where the incident happened, in poor visibility and driving rain.
She died later in Derriford Hospital, Plymouth, after being found by rescuers within 20 minutes of her accident and being airlifted by helicopter. Rescuers attempted resuscitation on Charlotte at the scene of her discovery and during the evacuation to hospital, but she died early on Monday.
She was among more than 80 young people training for the annual Ten Tors challenge, run by the Army. Teams are supervised by leaders during training. The challenge involves up to 400 teams of six teenagers covering between 35 and 55 miles over two days.
Many outside the outdoor world have questioned the wisdom of continuing the training when such bad weather was forecast and prevailing, but initial views of those involved suggest Charlotte’s death was an unfortunate and unforeseeable accident.
The Ten Tors website carries this statement: “I know that everyone associated with Ten Tors, past and present, would want to express their sympathy and heartfelt condolences to the family and friends of the young girl who tragically died following an incident at Walla Brook this weekend.
“Our thoughts are with you all at this very difficult time.”
Organisers have said the event will still go ahead. Her school principal Stuart Nicholson said: “An Edgehill College group was one of a large number taking part in a training exercise on Dartmoor this weekend. This demonstrates the enormous value attached to the Ten Tors Challenge in May.
“It tests mental and physical strengths in a group enterprise and at Edgehill it characterises the spirit of personal development and growth towards independence.
“This weekend's exercise was part of routine practice. The students are trained to the customary high standards expected by the Ten Tors organisation and all appropriate preparation and risk assessments had been made.
“Dartmoor presents an unpredictable setting. That this led to the incident which caused Charlotte Shaw's death is a matter of extreme sadness to all those associated with the college. Naturally we are now part of the ongoing investigation into particular circumstances and the Ten Tors exercise as a whole.
“In college we are working with appropriate support services to meet the needs of distressed students and staff.
“We are grateful for the many expressions of sympathy and support already received for pupils, staff and especially Charlotte's family.”
Her death is the first fatality experienced by the Ten Tors organisation.