FBI investigators have found the possible presence of blood in a car linked to the case of Rachel Cooke, who has been missing from Williamson County since January 2002, according to a sheriff’s news release.

An item on the passenger floorboard of a white 1998 Pontiac Trans Am and an item on the passenger door molding of the car both tested positive in preliminary tests for the possible presence of blood, the Williamson County sheriff’s release said.

The car was found in the Dallas area in the spring after authorities received a tip about the case. It was taken back to Williamson County, where FBI forensic analysts spent hours collecting possible evidence that was then sent to the FBI Laboratory in Quantico, Va.

Further testing is being conducted but the full details of the results will not be released to protect the integrity of the investigation, the release said.

RELATED: Officials, mother hope car will yield clues to Cooke’s disappearance

No arrests have been made in the Cooke case. The then-19-year-old disappeared after she went jogging alone near her parents’ Georgetown home on Jan. 10, 2002. The California college student was home for Christmas break.

Anyone with information about Cooke is asked to call 1-800-CALL-FBI (1-800-225-5324) or submit a tip online at tips.fbi.gov or contact your local FBI office or the nearest American Embassy or consulate.

A $100,000 reward is being offered for information leading to her location.