NORTH VERSAILLES (KDKA) — Police used dogs and thermo-imaging cameras Thursday in their search for a woman from North Versailles.

Ruth Ann Mullennix, 55, was last seen in Wilmerding on Monday night.

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Police said Mullennix is bipolar and has a history of alcoholism.

Her coat and cell phone were found Thursday in a rail yard beneath the Westinghouse Bridge.

Mullennix is 5-feet-6-inches tall, weighs 115 pounds, and has blond hair and green eyes.

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She was wearing a blue shirt, blue jeans and brown shoes.

Stay with KDKA for the latest on this developing story.

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