Updated

A sudden and 'terrifying' flash flood struck the Grand Canyon on Saturday, killing at least two people and leaving more than a dozen hikers missing or unaccounted for. Witnesses described a clear day turning to chaos as floodwaters surged through the canyon, prompting a large-scale emergency search and rescue response. Days later, continuing chances of rain are complicating the search, making conditions more hazardous for rescue crews still combing the canyon for missing hikers. Officials say the unstable weather has slowed efforts even as they push to locate remaining unaccounted-for visitors.