SAN ANTONIO (AP) — A man who worked at children's shelters and as a tumbling coach and a nanny has been sentenced to 60 years in federal prison after pleading guilty in San Antonio to six counts of producing child pornography.

The San Antonio Express-News (http://bit.ly/1NECDoY ) reports Chief U.S. District Judge Fred Biery on Friday sentenced Ryan Bradley Pitts.

The charges came after FBI agents in San Antonio in 2013 downloaded images from a file-sharing network Pitts used. Pitts had 21,000 images of child pornography and 1,200 videos, including some of bound and gagged children being sexually assaulted.

Some of the victims were under his care during his stints as a nanny or when he worked at children's shelters or tumbling schools between Austin and Dallas. Victims ranged in age from 3 to 9.