(CBS NEWS) More than a dozen women are trying to solve a heartbreaking mystery. They want to know if a now-closed St. Louis hospital stole their newborns and sold them.

Each mother was told her baby had died after birth, but now, decades later, they have reason to doubt that, and they’re demanding an investigation, reports CBS News correspondent Vinita Nair.

The allegations of a baby-selling ring started with the reunion of a mother and daughter posted on the internet in March. All of the women say they gave birth back when the facility was Homer G. Phillips Hospital, 36 years ago.

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