After Nepal, a powerful flash flood hits Grand Canyon in Arizona leaving about 15 people missing; footbridges, bunkhouses destroyed by mud and boulders: Watch video

A powerful flash flood swept through Arizona's Grand Canyon on August 29, sending muddy water, huge boulders and debris through Bright Angel Canyon and the Colorado River. About 15 people may still be missing or unaccounted for, while authorities evacuated 62 hikers and campers from the affected areas, according to the National Park Service and reports cited by the Times of India.