Police want help identifying a little girl whose image was among hundreds found on sexually explicit videotape allegedly seized from a Whitby, Ont. man in custody on nearly 300 sex and child porn charges.

The little girl was about five or six years old at the time and may have stayed overnight at the home east of Toronto when the offence took place, police said.

Investigators said she could be a family member or a friend of the family, and would now be in her teens.

Michael "Ross" Stratton, 39, is facing nearly 300 charges, the majority of them for sexual assault, making child pornography and forcible confinement.

Police have identified more than 10 victims from the sexually explicit material allegedly recovered from his Skopit Road home, but fear there are still more.

The victims are all girls who range in age from five to 18, CTV's Chris Eby reported.

Anyone with details about the case or the unidentified victim is asked to contact Durham police at 905-579-1520, ext. 5363. Anonymous calls can be made to the Durham Region Crime Stoppers at 905-222-8477.

Police believe some of the victims were abused as far back as 20 years ago inside a group home in Richmond Hill, north of Toronto, run by Stratton's parents.

Detectives are now contacting the former residents of the home.

Stratton, a once-married factory worker, may have been hosting parties at his Whitby bungalow and offering the children a place to hang out, police said.

According to one neighbour, it was common to see young people entering the home.

"I'd see a teenager and she'd bring a small child. My husband thought it was a half-way house," the woman said.

Police also say they found pictures of children taken on outings to public places like Canada's Wonderland, an Ontario amusement park.

It's believed the videos were destined for the Internet, where law enforcement officials face a constant struggle against an estimated 14 million child pornography websites. About 20,000 new images of victims are being created every week.

The images allegedly recovered from Stratton's home were disturbing, police said.

"We had one young officer that we had assisting us that couldn't view the videos, it's that sickening," said Durham Region police Insp. Dave Wilson.

The case broke in June when a distraught woman threatening suicide came forward alleging she has been abused by Stratton.

The investigation is believed to be one of the worst child sex cases in Canadian history.

Stratton's next court appearance is Nov. 7. He is already in custody on other sex charges.

With files from CTV's Chris Eby