Canadian police say they have found the remains of six people at a property linked to an alleged serial killer who has been charged with five murders.
"I anticipate more charges being laid", Idsinga added.
BBC News reported that McArthur had a deal with the home's elderly residents where he would care for their lawn for free, if he could store his landscaping equipment there.
McArthur has so far been charged with five counts of first-degree murder.
McArthur was arrested and charged January 18 in the presumed deaths of Selim Esen, 44, and 49-year-old Kinsman who police said went missing from Toronto's Gay Village last spring.
Detective Sgt. Hank Idsinga said that the bodies were found on a property McArthur used as storage in exchange for landscaping work.
Police expect to lay more charges. Police recovered 15 flower planters from the property, but not all have been fully searched.
Using ground-penetrating radar, police have also discovered areas of interest on the property and are hoping to excavate a section of the backyard in the coming days.
McArthur, 66, was arrested on January 18 amid continuing concerns from members of the Church and Wellesley community who believed that someone was preying on men with ties to the neighbourhood.
Alleged Bruce McArthur victims, clockwise from left, Majeed Kayhan, 58; Dean Lisowick, 47; Soroush Marmudi, 50; Selim Esen, 44 and Andrew Kinsman, 49. "We are dealing with some agencies overseas", said Idsinga.
"There is an extensive digital investigation going on", said Idsinga. Toronto police are in the process of digging up all of the planters McArthur has installed around the city.
He said they plan to dig back "quite far" into hundreds of missing persons cases to see if McArthur could be connected, and confirmed that they will be looking at McArthur's past.
According to bail documents, Todd McArthur's home address is listed as his father's Thorncliffe Park apartment, which is one of numerous properties Toronto police are investigating.