He says climbers are aware of the risks of the sport and that granite erosion takes place on El Capitan and in the Sierra Nevada mountain range. The victims, a couple visiting the park from Great Britain, were in the park to rock climb but were not climbing at the time of the initial rockfall.
According to the National Park Service (NPS), another person was injured in the rockfall, which occurred around 2 p.m. local time Wednesday.
Officials did not identify the person who was killed or the person who was injured.
"The release point appears to be near the "Waterfall Route", a popular climbing route on the East Buttress of El Capitan".
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Longtime Yosemite climber Peter Zabrok said he's never seen anything like the chunk of rock that broke off. Zabrok said it was as big as an apartment building.
This is the climbing season in Yosemite National Park and there are many climbers on El Capitan and other climbing routes in the park. It was not clear Thursday if the victims were climbers or tourists.
"I observed a 100 foot by 100 foot by 100 foot piece of granite peel off and fall 2000 feet to the ground".
Images showed a woman being carried into a helicopter by two rescue workers.
Ryan Sheridan said in the early morning hours Thursday that El Capitan remained active with rock falls.