Deadly flash floods in Nepal have left hundreds of tourists missing, including a number of American citizens. The disaster struck a region bordering China, causing widespread devastation. Officials are currently working to locate those unaccounted for, but efforts are hampered by the scale of the flooding and challenging terrain. The cause of the floods is currently under investigation, though heavy rainfall is believed to be a significant factor. The situation remains critical as search and rescue teams continue their work. Further updates are expected as more information becomes available from the affected region.