The explosion at the Massey Energy Co. mine — the deadliest U.S. mining disaster in 25 years — took place during a shift change Monday afternoon. Its cause was unknown Tuesday, but officials pledged a thorough investigation. The mine is about 30 miles south of Charleston, West Virginia.
Anguished family members were clinging to hope that the four unaccounted-for miners might still be alive.
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article courtesy of CNN.com