The Thunder Bay Police Service has arrested a city man on charges related to child pornography.

On Thursday, police searched a North Harold Street residence in search of child pornography images. Investigators seized 15 computers, six hard drives and roughly 10,000 DVDs.

Because of the large volume of items seized, determining the number of images in the accused's possession will take months to complete, police reported on Friday.

Frederica Street explosive

This home on Frederica Street East was hit by an explosive device Friday night, police report. (Adam Burns/CBC)

The Thunder Bay Police Cyber Crime Unit initiated the investigation in May 2012 when it became aware of a Thunder Bay internet user who was making use of a peer-to-peer file sharing network. Investigators flagged 244 suspected child pornography files and continued the investigation to confirm the files were indeed child pornography.

Late last month, three videos were obtained and confirmed to be child pornography.

A search warrant was prepared and executed on Thursday, and 38-year-old Dan Nawrocki was arrested at his North Harold Street residence.

Nawrocki has been charged with possession of child pornography and making child pornography available.

He made a court appearance Friday morning and has been remanded to the Thunder Bay District Jail with a court date of Nov. 18.

Thunder Bay police noted the incident is not connected to the current international child pornography investigation.