Mount St. Helens erupts again; dome is growing

Mount St. Helens erupted again Sunday night, the giant lava dome inside the volcano's cone bursting open on one side, the US Geological Survey said. The eruption, one of a series in which the dome has continued to grow in size, followed several hours during which the volcano trembled with up to 10 earthquakes per hour.

Both USGS and University of Washington scientists said the eruption would probably not become explosive and that little or no ash would be emitted.