(Corrects headline and paragraphs 1 and 5 to show the trapped people were not divers) May 28 (Reuters) - The leader of a Thai volunteer group helping to extract seven people trapped in a cave in Laos said on Thursday that more oxygen tanks would be needed to complete the rescue mission.

Five of the seven villagers who became trapped in a cave that flooded in Laos were found alive by rescuers Wednesday, in an incident echoing the dramatic 2018 rescue of teenage soccer players in Thail...