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ELMHURST, Ill. – Authorities say a Chicago-area mother fatally shot her two teenage sons before setting their house on fire and turning the gun on herself.

The DuPage County sheriff’s office says 43-year-old Jamie M. Jones killed 16-year-old Jason M. Harris and 19-year-old Nathan A. Harris in their home in Elmhurst late Friday. She then set the house ablaze and shot herself to death.

The sheriff’s office says investigators have determined the deaths were a murder-suicide.

DuPage County Sheriff James Mendrick didn’t provide information on the mother’s motivation, but he called her actions “completely inconceivable.”

Mendrick offered his condolences to the family and friends of the deceased and urged anyone who is going through stressful times to “please seek help.”