ARIZONA — Emergency crews are conducting a major search-and-rescue operation in the Grand Canyon National Park after a powerful flash flood swept through parts of the canyon.

Latest reports indicate one person has died and approximately 15 people are missing, with authorities continuing efforts to locate people who may have been caught in the flooding.

The flooding damaged infrastructure in affected areas, including remnants of a stone bridge along Bright Angel Creek. The incident has raised concerns about the safety of hikers, visitors and workers in areas affected by sudden extreme weather.

Flash floods can develop rapidly in canyon environments, where narrow terrain can dramatically increase the speed and force of rising water.

The rescue operation remains active as authorities work to determine the full scale of the disaster and account for everyone who may have been in the affected area.

The incident also highlights the risks facing visitors to some of America's most popular national parks, where severe weather can turn dangerous with little warning.

Officials are expected to provide additional information as search teams continue their work and more details about the victims and missing visitors become available.

The Grand Canyon disaster is now one of the most closely watched emergency incidents in the U.S. as rescue crews race against time to locate those still unaccounted for.