A lightning bolt travelled down a cable and ignited the methane blast that led to the deaths of 12 miners in West Virginia last year, a US report says.The report, obtained by the Associated Press, also says methane in a sealed section was not monitored and that the seals did not contain the blast.
The blast sealed off the miners for 40 hours and only one, Randal McCloy, survived the carbon monoxide poisoning.
The disaster at the Sago mine led to sweeping changes in US mine safety.
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