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image captionDerek William Barks, Derek Moore, Jason Shingler and Dorothy Bailey died in the 2015 explosion
Manslaughter charges have been dropped against the owner of a wood mill where four people died in a blast.
George Boden was a director of Wood Treatment Ltd in 2015 when the explosion happened at Wood Flour Mills in Bosley, Cheshire.
Corporate manslaughter charges against the firm have also been dropped.
At a special Nightingale Court at Chester Town Hall, Mr Boden pleaded guilty to a health and safety offence.
The exact cause of the fatal blast is not known, but it was thought to have involved an explosion of wood dust, the trial heard.