PARAGON, Ind. -- More bones were discovered Monday at the site where the remains of Indiana University student Jill Behrman were found, but they haven't determined whether the bones are hers.

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Monday is at least the fourth straight day investigators have found bones at the site. More analysis by an anthropologist is needed to determine whose remains they are, police said. The bones are in addition to the remains that were confirmed to be Behrman's.

Behrman, 19, was last seen riding her bicycle alone in May 2000 near Bloomington. Her remains were discovered March 9 in a rural field by a hunter who was scouting the countryside north of Paragon, about 30 miles southwest of Indianapolis.

Morgan County Coroner Dan Downing said searchers found other items Saturday that may be critical to establishing how Behrman's body came to be in the field, but he declined to offer details.

The discovery of the remains last week surprised detectives, who had suspected that Behrman was killed near a creek about 25 miles south of the Paragon site.

Officials want to reconstruct as much of her skeleton as possible. The search for bones was so intense that "if a hunter had dropped a gum wrapper 50 years ago, the searchers would find it," Downing said.

Divers from the Indiana State Police also plan to search a nearby pond and a creek about 1,000 yards from the site.

Investigators have widened the main search area to a half-acre after initially concentrating on an area about 100 feet by 50 feet.

More than 20 state police recruits from the Indiana Law Enforcement Academy assisted in Monday's search.