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Alaska’s Mount Redoubt volcano is rumbling again, and an explosive eruption could come at any time, the Anchorage Daily News reports. “Seismic and rockfall activity increasing,” warned a volcano observatory. “Eruption likely in coming days; could occur at any time with little or no warning.” Redoubt last blew its top April 4 after weeks of explosions that sent ash miles into the air. (Read more Alaska stories.)