Hydrothermal eruption in Yellowstone National Park sends sightseers fleeing The Guardian‘Spectacular and definitely hazardous’: Yellowstone geyser erupts, firing steam and debris over nearby tourists Livescience.comHydrothermal Explosion at Yellowstone Sends Tourists Racing for Safety The New York TimesYellowstone Park Officials Conclude Cause Of Explosion The Weather ChannelExplosion at Yellowstone National Park forces tourists to run for safety Sky News