A 24-year-old mother and her five-year-old son have been killed on Dartmoor.
It is not clear whether they were crushed by falling boulders or fell from the rock face. Devon and Cornwall police were treating their deaths as unexplained.
Desolate Haytor stands nearly 1,500ft high above sea level and is one of the most popular landmarks on the national park in Devon.
A police spokesman said: "Police and emergency services were called to a serious incident at Haytor, Newton Abbot, following reports that two people had fallen from rocks.
"Police can confirm that a woman and her young son have died as a result of the incident."
Rescue services including police, the air ambulance and Dartmoor Rescue Group attended the scene.
A spokesman for Dartmoor National Park Authority warned that environments like Haytor posed danger for walkers.
Mike Nendick told the BBC: "When you have an attractive landscape, whether it's on the coast or moors, it attracts people. There's always the potential for accidents.
"It wouldn't be appropriate to comment on the accident today. But we would urge members of the public to wear sensible footwear and consider weather conditions when walking on the moors."