Search warrants in the case of a 28-year-old Utah woman missing for three weeks have been sealed.

Susan Powell was last seen on Dec. 7, when husband Josh Powell says he left their suburban home in West Valley City about 12:30 a.m. to take their two boys camping in freezing conditions.

She was reported missing the same day when she failed to show up for her stockbroker job and her kids weren't dropped off at day care.

Josh Powell returned later that evening to find his wife missing. He has been named a person of interest in the case, but not a suspect.

Police have searched the Powell home and van. The 3rd District Court clerk's office said Monday that the search warrants have been sealed by a judge.

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