Provincial police say an autopsy has failed to determine the cause of death of a four-year-old child last weekend near Hearst, Ont.

OPP say they were called Saturday to assist Nishnawbe-Aski Police with a child in medical distress on the Constance Lake First Nation.

The girl was taken to hospital where she was pronounced dead.

Police say further medical testing will be done in an effort to determine the cause of death and the investigation is ongoing.