Frigid weather gripping much of the United States led to a frenzied search in northwest Nevada, where rescue teams are searching a mountainous area for two adults and four children who went to play in the snow and never returned.

James Glanton, 34, and Christina MacIntee, 25, are missing, along with Glanton's two children and MacIntee's niece and nephew. The children are three to 10 years old, the Pershing County Sheriff's Office said.

The group set out Sunday for Seven Troughs mountain range and haven't been seen since.