Detectives investigating the killing of a British engineer and his family in the Alps have revealed his wife was previously married to a man who died the same day as the shootings.

The brother of a British engineer shot dead with his wife and mother-in-law in the French Alps has been bailed after being arrested and questioned by police.

The brother of a British engineer shot dead with his wife and mother-in-law in the French Alps last year was arrested today on suspicion of conspiracy to commit murder.

A 54-year-old man was arrested in England today in connection with the murders of three members of a British family and a French cyclist who were shot dead in the Alps in September last year.