TUCSON, Arizona — Frustrated volunteers have taken the search for Nancy Guthrie into their own hands — combing the garbage-filled desert ditches and homeless camps near her home for clues.

And on Sunday, they came up with a possible lead — a black backpack was discovered just two miles away.

The Post was at the scene Sunday morning when the torn-up black, Swiss Gear-brand bag was found in a storm drain that doubles as a homeless encampment.

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The location was a short drive from the 84-year-old Nancy’s house in the Catalina Foothills neighborhood north of Tucson.