The group that ran an adventure holiday to Italy in which a boy scout died during a "canyoning" activity said it was "unclear" why the teenager lost consciousness as he entered the water at the Lillaz waterfalls.
Outdoor education provider Acorn Adventure said the boy, 14, was wearing a helmet and a buoyancy aid.
They were jumping into the water, where instructors were waiting for them. All participants were wearing buoyancy aids, wet suits and helmets as is standard on this activity, carried out by hundreds of participants every year for the past 18 years.
As yet it is unclear why this participant lost consciousness as he entered the water. Despite very swiftly being given CPR by trained first aiders and nurses who attended the scene, very sadly paramedics were unable to resuscitate him.
More top news
Big Ben will fall silent on Monday for renovations following a backlash from MPs over the proposed four-year timetable for the work.
Rain will push into the northwest, turning heavy and persistent in places
Thousands of dangerous appliances are still in use across the UK despite years of warnings about the dangers.