SHELBYVILLE, Ind. (AP) — Authorities have arrested a central Indiana man who they say is the state’s most prolific disseminator of child pornography.

The Indianapolis Star reports 68-year-old Michael Dean Sermersheim of Shelbyville was arrested Tuesday and faces 27 counts each of child exploitation and child pornography possession.

Indiana State Police say Sermersheim downloaded more than 9,000 child porn media files over the course of roughly four months. A probable cause affidavit says State Police began monitoring him March 25.

Court documents say Sermersheim initially denied any wrongdoing when police went to his house Tuesday, but later said he downloaded files, kept them long enough for others to download, and deleted them.

It wasn’t immediately clear if Sermersheim has an attorney.