MCMINNVILLE, Ore. -

It's been a week since 38-year-old Jennifer Huston of Dundee disappeared, and searchers are running out of leads.

Newberg-Dundee Police say searchers in the air and on the Willamette River looked without success Wednesday for an oil sheen that may have indicated a car in the water.

Searchers also checked roads around Gaston and Bald Peak. They plan an air search Thursday and Friday of central and West Yamhill County.

Police in all western states have been asked to be on the lookout for Huston.

She was last seen last Thursday withdrawing a small amount of money from an ATM, fueling her SUV and buying a Gatorade, trail mix and a non-lethal amount of sleeping pills.

Her husband reported her missing Friday.