The facts occurred overnight from Thursday to Friday at the Besançon home of this mother and her three children, the same source said, confirming information from the regional daily L’Est Républicain.
For no apparent reason or prior argument, the minor, whose age was not specified, first attacked his brother with a knife. The mother and sister then tried to intervene before being seriously injured in turn with a knife, said the police source.
Arrested and placed in police custody, the teenager, known for a psychiatric history, was examined by a doctor and was placed in the psychiatric unit of a hospital in the region, we added.
The three victims were hospitalized but the police source could not specify on Saturday the evolution of their state of health.
The minor will be heard later. The investigation was entrusted to the departmental security of the Besançon police station. Asked by AFP, the Besançon prosecutor’s office did not wish to communicate.