COLUMBUS, Ohio (AP) -- A western Ohio man will spend at least 21 years in prison after pleading guilty to secretly videotaping young girls in a bathroom at his home and trading the images for other online child pornography.

Thirty-one-year-old Mickell Close of Quincy entered the plea in federal court in Columbus Thursday.

Federal authorities say they arrested Close in November as part of a nationwide child pornography sweep that rescued dozens of victims of child exploitation.

A federal agent said numerous images of young girls in sexually explicit activity or bondage were found on Close's computers.

The Columbus Dispatch ( http://bit.ly/WcTwug ) reports that the plea agreement calls for a prison sentence of 21 to 27 years, plus 20 years of supervised release. No sentencing date was set.

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Information from: The Columbus Dispatch, http://www.dispatch.com