An American man and his teenage son died last month after they were swarmed by wasps while ziplining at an adventure camp in Laos and stung many dozens of times, a hospital official said Thursday.

Dan Owen, the director of an international school in neighboring Vietnam, and his son Cooper were attacked by the insects on Oct. 15 at the Green Jungle Park, as they were descending from a tree at the end of the zip line.

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.

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