 More movement on Mount St. Helens. The volcano has already been experiencing a series of earthquakes, but now part of the crater rim has collapsed. The U.S. Forest Service says a cornice, or a piece of the ice that extends beyond the rim, broke off and fell more than 1,000 feet into the crater below. This has made the top of Monitor Ridge highly unstable, and hikers and mountain climbers are urged to use extreme caution. Jeff Pojola, Northwest News Radio.