A rural Casco man faces charges of possession of child pornography and sex offender registry violations after Kewaunee County authorities received a cyber tip from the National Center for Missing and Exploited Children (NCMEC), Sheriff Matt Joski said Wednesday.

Sean Evansen, 35, was arrested after the Wisconsin Department of Criminal Investigations and the Kewaunee County Sheriff’s Department executed a search warrant at his residence, which Joski said produced several thousand images of child pornography.

Joski said NCMEC had flagged “a significant amount of known child pornography” that had been uploaded via a picture-sharing application. The center’s tip was relayed through the local Internet Crimes Against Children (ICAC) task force.

Evansen is a registered sex offender after being convicted of first-degree sexual assault of a child in 2000, after a Christmas Eve incident in Calumet County that occurred when he was 17 years old. He was booked into the Kewaunee County Jail on police charges of possession of child pornography and sex offender registry violations. Evansen is currently being held on a court-ordered $25,000 cash bond. A criminal complaint had not been filed as of Wednesday.