A 19-year-old young man died in Dax (Landes) while attending a party in a building under construction, reports France Info on Tuesday.
He would have fallen from the 7th floor during the event.
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The first elements of the investigation showed that the fall of the young man had occurred during the night of Monday 17 to Tuesday 18 May.
The victim was already in cardio-respiratory arrest when help arrived and died shortly after.
The reasons for his fall are still unknown, but police are trying to determine if it was an accident or a criminal act.
With this in mind, four young people aged 18 to 21, who are suspected of having participated in the evening, were placed in custody, according to the Dax prosecutor's office.