TELLURIDE, Colo. (AP) — Colorado officials say they still are trying to determine what caused the death of two girls on a rural farm.

Pathologist Michael Benziger said during a court hearing Monday that 10-year-old Makayla Roberts and 8-year-old Hannah Marshall had been dead "for several weeks to months" when their bodies were found in early September.

The Telluride Daily Planet reports that a medical examiner in New Mexico will perform more tests.

According to court documents, one member of the small group living on the Norwood farm told police that a woman named Madani Ceus was acting as a "spiritual leader" ordered the children kept in a car without food or water for days.

Ceus and the girl's mother have been charged with murder. Three other adults face fatal child abuse charges.

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Information from: Telluride Daily Planet, http://www.telluridenews.com