An individual matching the description of the man suspected of murdering his family was seen at the Bethanie Sisters, in Montferrand-le-Château. Several people from the community were questioned, and a cup used by the suspected man was seized.

DNA traces were taken and should soon be compared with those of the father of the family, placed under seal. It is of course impossible not to think of the monumental error of October 2019 when the Scottish authorities arrested a certain Guy Joao at Glasgow airport.