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A video warning of the hidden dangers of carbon monoxide poisoning has been published by the The Marine Accident Investigation Branch following the deaths of a couple and their dog on the Norfolk Broads.

The film was made on the boat in which Alan Frost and Tina Wilkins, from Grays in Essex, died.

It's believed the couple had left their engine running while the back of the boat had its canopy closed. A slight wind caused the deadly fumes to get into their living quarters.