Grave fears for woman missing in SA outback for 16 days as search renewed

Police are expanding aerial searches near where the abandoned car of 41-year-old Trisha Graf was found

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South Australian police hold grave fears for a woman missing in the outback for 16 days and have renewed search efforts near where her car was found abandoned.

Trisha Graf was last seen in the early hours of Friday 12 December in the Roxby Downs area, 510km north of Adelaide.