WATCH: Heart-stopping video shows tourists caught in a sudden flash flood at a waterfall in Thailand. The water came rushing through Mae Sa Waterfall in Chiang

WATCH: Heart-stopping video shows tourists caught in a sudden flash flood at a waterfall in Thailand. The water came rushing through Mae Sa Waterfall in Chiang Mai, sweeping several people downstream within seconds. Park rangers eventually helped get everyone to safety, with the tourists reportedl…