FOX: The father of a missing 8-year-old California girl pleaded with her to "scream, kick, do what you need to do" to escape her captors as police sifted through trash for signs of the child.
Detectives also planned water searches of an area lake for much of Thursday, they told reporters.
Sandra Cantu's dad Daniel said he has spoken at length with police.
"I've just gotten through a couple hours of being interrogated," Cantu told FOX San Francisco affiliate KTVU.
The missing child's father will be re-interviewed, said Tracy Police Lt. Jeremy Watney. He declined to comment on whether the father had taken a polygraph.
"He's scheduled to come in and talk to us again today," Watney said at a news conference.
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