More than 50 students have dropped out of the Ten Tors challenge on Dartmoor due to injury.
#Tentors update: 53 fall outs, just the usual sprains & strains. Raining off and on and pretty windy. It's called a challenge for a reason.
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A 14-year-old boy has been arrested in connection with the incident.
15-year-old Ryan Molloy hasn't been seen since 3 December.
Unsettled, cold and breezy