More than 20 people are thought to be missing or unaccounted for after flash flooding swept through parts of the Grand Canyon.
Flash floods struck the Bright Angel Canyon and the Phantom Ranch area around 14:30 local time (22:30 BST) on Saturday, as reported by the National Park Service.
Sixty‑two people have so far been air‑lifted out of the area, with more expected to follow. No injuries have been reported.
The National Park Service said the flooding caused significant damage in some areas and that trails in the area have been closed.
Authorities warned that more thunderstorms and heavy rainfall were forecast for Sunday and Monday, which could lead to "additional flash flooding, debris flows, rockfall and changing trail and river conditions".
National Park Service officials are asking anyone who knows of hikers or backpackers who were in the inner canyon along the Bright Angel Creek corridor on Saturday to get in touch.
The Grand Canyon, which receives around five million visitors each year, is famed for its awe‑inspiring vistas and the Bright Angel Trail – its most popular hike.
Phantom Ranch, a historic lodge within the canyon, can only be reached by foot, mule, or rafting the Colorado River.
