A memorial service will take place in Westhoughton on Wednesday to remember the 344 men and boys who died in one of the UK's worst mining disasters.
They were killed in 1910 when the Pretoria Pit, situated on the border of Atherton and Westhoughton, blew up.
The day shift had just begun and 898 men and boys were working underground.
The victims will be remembered in a service at the local parish church before wreaths are laid at the memorial in the graveyard.
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