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Cascade, Idaho • A car belonging to a man suspected of killing a California woman and her young son and then fleeing with the 16-year-old daughter was found in the Idaho wilderness on Friday after horseback riders reported seeing the man and girl hiking in the area two days earlier, authorities said.

The riders reported seeing the two near Morehead Lake, an extremely rugged area about 70 miles northeast of Boise, around noon Wednesday, according to Ada County Sheriff's Department spokesman Patrick Orr. They didn't report it until later, after seeing news reports and realizing the pair was being sought.

Idaho authorities started searching Thursday and the car was found Friday morning. There have been no other reported sightings of the pair since Wednesday.

San Diego County Sheriff Bill Gore said when the riders saw the two, the girl, Hannah Anderson, did not appear as if she was being held against her will. He did not elaborate. She and the suspect, James Lee DiMaggio, 40, seemed healthy.

Brett Anderson, Hannah's father, said he was "very happy" that Hannah was spotted alive. He said he couldn't explain why his daughter didn't ask the horseback riders for help.

"We don't know what kind of frame of mind she was in or what he told her," Anderson said. "Maybe if she acted differently, there would be more dead people."

Hannah's grandfather, Christopher Saincome, also was relieved and refused to try to explain the girl's reaction to the riders.

"He could have strapped something to her and told her it was a bomb. He could have had her tethered to him," he said. "I'm sure she's totally in shock."

The car, a blue Nissan Versa, was covered in brush off a road about 5 or 6 miles from the spot where the man and girl had been seen. The license plates had been removed, but the vehicle identification number matched that of the car being sought, Gore said.

Police previously warned that the car may be rigged with explosives. Bomb experts planned to examine it.

Morehead Lake is in the Frank Church River of No Return Wilderness, a vast and rugged 2.3 million-acre preserve in the heart of Idaho. Because of its wilderness designation, the preserve is not open to motorized vehicles and traffic is limited to hikers and horseback riders.

The pine-blanketed area is at an altitude of about 7,800 feet and the lake itself is 7 miles into the wilderness area. Temperatures were likely to fall into the high 30s Friday night.

Gore noted that DiMaggio bought camping gear a few weeks ago.

Authorities throughout the West have been looking for the teen and DiMaggio since the bodies of the girl's mother, Christina Anderson, 44, and an unidentified child were found Sunday at DiMaggio's burned home near the Mexican border about 65 miles east of San Diego.

The unidentified body is believed to be that of Hannah's 8-year-old brother, Ethan. The body was badly burned and definitive identification hasn't been made.

DiMaggio was close to the family. Brett Anderson has described him as a best friend and said his children thought of him as an uncle.

Authorities have said DiMaggio had an "unusual infatuation" with the 16-year-old, although the father said he never saw any strange behavior. If he had, he said, "we would have quashed that relationship in an instant."

DiMaggio, a telecommunications technician at The Scripps Research Institute in San Diego, was planning to move to Texas and invited Christina Anderson and the children to his home last weekend to say goodbye, said Christopher Saincome, Anderson's father.

It's unclear how the two were killed, though police believe the crime was planned.

Brett Anderson said his friend is an outdoorsman.

"He was very interested in hiking and camping," Anderson said. "Whenever he had the chance and had the funds he would go on a hiking trip."

The Cascade area is an outdoorsman's paradise. Perched along the southeastern shoreline of the Cascade Reservoir and The West Mountains, the town is a popular summer getaway for hikers, campers and kayakers.

DiMaggio and the teen were hiking when the horseback riders encountered them, Gore said. The riders noticed the pair had light camping gear even though it was an extremely rugged area with extreme temperature swings. Summertime highs can reach the 90s and nighttime temperatures fall to the 40s.

The riders "did seem to think the two of them were out of place in that area," Gore said.

The sheriff said the riders chatted briefly with the couple but he didn't reveal details of the conversation.