TOLLGATE, Ore. A search continues today for a 13-year-old boy who disappeared while on a cross-country ski trip in northeastern Oregon.

Blue Mountain Television reports that Nathan Cain of Walla Walla, Wash., was skiing with his father and some adult friends when he got separated from the group Saturday near the Andies Prairie Sno-Park area, in Union County.

Nathan is a seventh-grader at Rogers Adventist School in College Place, Wash., the school's principal, Jim C. Weller, told the station.

The sheriff's office confirmed a search was under way but released no further details.

Weller says crews looked for the boy throughout the night Saturday, when temperatures dropped to the 20s. He was dressed in a light jacket and blue jeans. The search continued Sunday, reportedly with the help of a helicopter, but was suspended for the night when darkness fell.

Weller said searchers did pick up his ski tracks but they died out after a while.

Andies Prairie is in the Umatilla National Forest, just off State Highway 204.