A southwestern Missouri registered sex offender has been ordered to spend a decade in federal prison for possessing child obscenities uncovered after he was found riding a bicycle in women's clothing.

Thirty-five-year-old Rusty Mann also was sentenced Monday in Springfield to lifetime post-prison supervised release.

Mann, who has previous convictions of child molestation and sexual misconduct involving a child, pleaded guilty in March.

He was arrested in October 2011 when a Springfield police detective saw him approach a playground on a bicycle while wearing a mini skirt and women's knee-high boots. Federal authorities say Mann was identified as the person who had been leaving soiled diapers and clothing on the playground.

Authorities say Mann's cell phone contained images of suspected child pornography and obscene cartoon depictions of minors.