LOS ANGELES — A Huntington Beach man who once served as a referee and coach in the American Youth Soccer Organization was sentenced Monday to 30 years behind bars for having hidden a camera in a location where he knew an underage girl would disrobe, and persuading a second child in a foreign country to send him nude photos of herself.

Mark Phillip Oster , 65, pleaded guilty last year in Los Angeles federal court to a single count of production of child pornography.

In his plea agreement, Oster admitted posting images of child pornography to a website on the dark web dedicated to sharing images and videos of child pornography and to the discussion of child sexual abuse.

On the site, he shared his knowledge of how child pornography is produced in the Philippines, and explained how sexual

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