FBI agents talked by telephone with the mother of Christopher Fink on Saturday, hoping she would lead them to her son and his wife, Kyndra Lee, who have been on the run from authorities since Sept. 19, when the couple snatched their 20-month-old son, David, from Primary Children's Medical Center.

And although Cheryl Gardner contacted the FBI on her own, she had little to say, FBI spokesman George Dougherty said."Contact was made, but her location was not determined," he said. "We'd like to speak with her again."

Gardner, 43, and her husband, Richard Gardner, age unknown, live in western Pennsylvania. On Saturday, FBI agents were working on a tip that the couple was headed west to rendezvous with the Finks. Agents didn't know where the rendezvous point might be or if the purpose of the meeting might be to hand-off baby David to his grandparents.

And those questions remained unanswered even after agents spoke with Gardner Saturday afternoon.

The Finks - or at least a couple closely matching their description - were last spotted Thursday in Heber. Sightings have also been reported in Cedar City, Provo, an Emery County canyon, and in Cheyenne, Wyo.

The FBI is offering a $20,000 reward for the apprehension of the couple. Authorities are anxious to find the couple because David Fink's health is in jeopardy.

"We just want to get him back here and make sure he gets checked out and is safe," Dougherty said. "We hope that either the parents or the grandparents realize he needs medical attention or that someone in the public sees them and gets us the information."