An American man and his teenage son died last month after they were swarmed by wasps while zip lining at an adventure camp in Laos and stung many dozens of times, a hospital official said Thursday. The camp is located outside the city of Luang Prabang, a popular tourist site in the Southeast Asian nation that was named a UNESCO World Heritage Site in 1995. The two were taken to a local clinic and then transported to Luang Prabang Provincial Hospital where they arrived in critical condition, said Jorvue Yianouchongteng, the emergency room physician who received them. "The son was unconscious and passed away after half an hour, while the father was conscious and passed away about three hours later," he told The Associated Press. Farmers burn crop waste from a field outside the Laos UNESCO heritage site of Luang Prabang, Saturday, April 6, 2024.