The tragedy had upset the small town of Vaudricourt in Pas-de-Calais.
On Monday March 14 in the morning, the bodies of Achille and César, two children aged 4 and 7, were found in the back of their father's burning vehicle.
The man, who had custody of his sons for the weekend and had to take them to school, was discovered near the vehicle, seriously burned.
Suspected of having set fire to it, he was indicted on Thursday for murder, the Béthune prosecutor's office announced on Thursday.
On the day of the events, he explained "having set fire to the vehicle, getting into it before changing his mind and leaving the burning vehicle alone", indicated the public prosecutor Thierry Dran.
The mother had requested sole custody of the two children.
“Suspected of being the author of the fire, he was hospitalized”, but on May 3, the improvement in his state of health allowed him to be placed in police custody, writes the prosecution in a press release released on Thursday.
At the end of his police custody, he was indicted on the charge of "murders of minors aged fifteen by ascendant" and placed in pre-trial detention.
Separated from him for more than a year, the mother of the two boys, a psychiatric nurse, explained during a white march at the end of March that she had requested sole custody of the children.
But his ex-companion had obtained in summary custody rights for the weekend.
A hearing of the family court judge was to take place in June.
A white march for two children who died in a burned car
Two young children die in father's car fire
Lille
Child
Car
Fire
Hauts-de-France
Justice
Bethune