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Police say Holly Bobo investigation narrowing

Holly Bobo Personal Photo

(CBS/WREG/AP) PARSONS, Tenn. - Tennessee law enforcement officials say that the search for missing nursing student Holly Bobo is narrowing, as they begin the process of identifying persons of interest in the case.

Pictures: Holly Bobo Missing

Tennessee Bureau of Investigation spokeswoman Kristin Helm said many possibilities have been ruled out, and that the focus of the investigation and search is still on the area surrounding the small community of Darden, where Bobo lives with her parents and brother.

According to the TBI, searchers found an additional piece of evidence Friday that may pertain to Bobo, but they are not releasing what it is, reports Reuters.

The new clue was found along the road in the northern part of Decatur County, Tenn. 

While police initially believed an abductor dragged Bobo, 20, away as she left for school last Wednesday, investigators now suspect it was a community member in camouflage who led Bobo into the woods near her home.

Authorities have refused to rule out anyone in the community of Parsons, about 100 miles northeast of Memphis, as a potential suspect.

Bobo is 5-feet-3-inches tall and weighs 110 pounds. She was last seen around 7:30 a.m. April 13 wearing a pink shirt and light blue jeans. Officials ask that anyone with information contact the TBI at 1-800-TBI-FIND.

Complete coverage of Holly Bobo on Crimesider