Series of earthquakes could signal eruption of Mount St. Helens.
VANCOUVER, Washington (CNN) -- A series of unusual earthquakes near Mount St. Helens in recent days has scientists warning that something more serious could be imminent.
The "hazardous event" the U.S. Geological Survey warns is possible could be an explosion caused by steam building up inside the volcano, or it could be more serious -- involving molten rock and deadly gas.
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