A helicopter with heat-sensing equipment joined other helicopters, snowmobiles and foot patrols Tuesday in the hunt for 35-year-old James Kim of San Francisco. His wife and two daughters were found Monday after being lost for more than a week.
Searchers found the pants Tuesday afternoon.
"It could be a sign he's trying to indicate the path he was going," Lt. Gregg Hastings of the Oregon State Police.
The search for James Kim took on new hope and new urgency in the forests of the Oregon Coastal Range, reports CBS News national correspondent John Blackstone. The 35-year-old technology editor has now been missing for 11 days. But Monday's rescue of his wife Kati and their two young daughters, all in good condition, shows survival against the odds is possible.
Officials said it appeared Kim was within five miles of the car he'd left Saturday morning wearing only tennis shoes, pants, a sweater and a jacket. Trackers had followed his footprints until dark Monday night.
Searchers said he had headed downhill and apparently walked out of an area covered with snow toward the Rogue River. Search and rescue teams checked the river with rafts Tuesday.
Kim — whose family told rescuers he had some outdoor experience and had eaten berries while stranded, not knowing if they were poisonous — took two lighters with him when he left the car, Anderson said. "Maybe he got a fire going," he said at a news conference.
Click here to see the rescue photos
Overnight temperatures have been in the mid 20s to mid 30s.
The helicopter that spotted the Kati Kim, 30, and her daughters Penelope, 4, and Sabine, 7 months, was a private aircraft contracted by the family, reported CNET, where James Kim is an editor.