The cheer and good fun at Belgium's Pukkelpop Music Festival was overshadowed by a dark cloud Thursday, when a massive storm swept through the grounds, killing three and injuring 71. Around 60,000 concertgoers attended the festival and dashed to take cover when the storm broke. Stage equipment dangled in high winds, and trees and scaffolds were brought down. Those injured were taken to nearby hospitals surrounding the town of Hasselt, where the festival took place. The incident is the second in a week to occur at an outdoor festival, following the collapse of a stage in 60 mph winds at the Indiana State Fair in Indianapolis, killing five and injuring dozens.