SCOTTS MILLS, Ore. -- After a search in rural Oregon failed to yield any trace of missing Utah mother Susan Powell, authorities say they may close the investigation.

Wayne Pyle, who is city manager in West Valley City, Utah, said Thursday that leads in the case have dried up in the three and a half years since Powell disappeared.

Police said earlier Thursday they found no signs of Powell after searching for two days at a rural site near Salem, the capital city of Oregon.

Susan Powell was reported missing in December 2009 after she didn't show up for work.

Her husband, Josh, said he had taken the couple's young boys on a midnight camping trip the night she disappeared.

Josh Powell killed himself and the couple's two sons in Washington state in February 2012.

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