Three held over 1984 French child murder mystery

The elderly relatives of Grégory Villemin, a four-year-old boy whose body was found in a river in eastern France after he disppeared from his family home, have been placed in custody for questioning, suspected of being the authors of poison-pen letters sent at the time of the murder, following an investigation by a specialist cold-case review unit of gendarmerie detectives.

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A couple in their 70s and a woman have been detained for questioning by police, 32 years after a crime that horrified France, reports BBC News.