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MOSCOW, July 7 (Xinhua) -- Methane vapor blew up in a nickel mine in central Russian on Friday, killing three workers and injuring some others, the mine's operator said in a report.
MOSCOW, July 7 (Xinhua) -- Methane vapor blew up in a nickel mine in central Russian on Friday, killing three workers and injuring some others, the mine's operator said in a report.