Trade unionists commemorate the anniversary of one of Britain's worst mining disasters
TRADE unionists commemorated the anniversary of one of Britain's worst mining disasters on Saturday.
An underground explosion at Pretoria pit, Atherton, in the historic county of Lancashire killed 344 men and boys on December 21 1910.
It was thought to have been caused by an accumulation of gas from a roof collapse the previous day and a faulty pit lamp.
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