(CBS/WREG/AP) PARSONS, Tenn. - Investigators are using new equipment in the search for missing 20-year-old Tennessee nursing student Holly Bobo.
On Monday, the Tennessee Wildlife Resource Agency began using site-imaging technology to look for clues in local lakes and bodies of water, as investigators expanded their search door to door.
Police believe that whoever abducted Bobo is a hunter or someone familiar with the area near her home, which is surrounded by rugged woodlands.
Police have asked people in the community to report who might have recently cleaned or sold a car or all-terrain vehicle, since only an all-terrain vehicle could have fled into the woods easily.
Authorities have refused to rule out anyone in the community of Parsons, about 100 miles northeast of Memphis, as a potential suspect.
"We have not eliminated anyone from the investigation," Mark Gwynn, Director of the Tennesee Bureau of Investigation, told CBS's The Early Show. "That's why we ask the community to look among themselves.
While police initially believed the attacker had dragged Bobo away, investigators now suspect it was a familiar community member who led Bobo into the woods.
"It might have been somebody close that kind of knew our routine - when I left, and when she left, and when my daughter left to go to school," said Dana Bobo, the student's father in a press conference.
Investigators have discovered several of Bobo's personal items, including her cell phone, purse and lunch box.
Bobo is 5-feet-3-inches tall and weighs 110 pounds. She was last seen around 7:30 a.m. Wednesday wearing a pink shirt and light blue jeans. Officials ask that anyone with information contact the TBI at 1-800-TBI-FIND.