Attendees offered a prayer to 43 victims who died in 1991, and to another person who died in the pyroclastic flows that occurred on June 23, 1993. A pyroclastic flow is a deadly, fast-moving mix ...

when he was swept up by a pyroclastic flow--a fast-moving mix of volcanic matter and superhot gases--and died. The eruption killed 43 people, including journalists, taxi drivers and firefighters.