ANTIOCH, California — Signs of disturbed soil and the discovery of bone fragments on the property where Jaycee Dugard was held captive for 18 years could indicate something is buried on a site where authorities have been searching and cadaver dogs earlier picked up a scent.

Authorities have spent days combing the land to see if Dugard's alleged captors can be tied to two other abductions from the late 1980s, but they also have cautioned that it's still too soon to know whether a soil "anomaly" and found bone fragments could mean any previous digging on the property was crime-related.

"It could be significant, and it could not be significant, but it's helping us target where we might do some digging," said Hayward Police Lt. Chris Orrey.

Hayward and Dublin police are investigating to see if there are any possible links between Phillip Garrido and the unsolved 1988 abduction of 9-year-old Michaela Garecht and the 1989 disappearance of 13-year-old Ilene Misheloff.

Garrido and his wife, Nancy, have been charged in the 1991 kidnapping of Dugard, who was reunited with her family last month after authorities arrested the couple. Prosecutors say they hid Dugard in their Antioch backyard. The Garridos have pleaded not guilty.