Ottawa police say a man is facing dozens of charges after he allegedly sexually assaulted four male victims -- including children -- over the course of 15 years.

They say the 41-year-old man's charges include aggravated sexual assault, sexual exploitation and secretly observing and recording a person nude.

Police say one of the alleged victims reported the accused to police on Feb. 1 after they saw in a news release that he was facing child pornography charges.

Investigators say his alleged victims ranged in age from six to 24 years old, including a child with disabilities.

Police allege the abuse continued until this year and say they're concerned there could be more victims.

They say Danyiel (Dan) Walker had a bail hearing on Friday.

In a statement Friday evening, Roger Neilson House said "this situation has outright shocked our community.

"Access to Roger Neilson House is given to families who find themselves needing our programs and services (including bereavement support) or at the discretion of other families in our care.  It is a secure locked facility, not open to the general public."

The statement said Roger Neilson House is "taking every measure to support and ensure the welfare of our current and former clients, as well as our staff and volunteers who are also very shaken by this situation."