MADISON, WI (WTAQ) - Madison Police continue to investigate an apparent severe case of child abuse.

Officials said a passer-by called 911 last week, after seeing a malnourished 15-year-old girl outdoors wearing only pajamas. The girl weighed only 70 pounds.

Police found her a couple blocks from her home – and they took her to a hospital where a doctor described the girl as a victim of “serial child torture.”

Police said her family lived in an upstairs part of their home, while the girl was forced to spend most of her time in their basement without much to eat.

Her 40-year-old father and 42-year-old stepmother were both arrested last Friday.