Police set up a roadblock in the municipal area near a farmhouse in Shedden, Ont., under investigation on Sunday afternoon.
Police raided a farmhouse owned by a former motorcycle gang leader on Sunday as they continued their investigation into Ontario's biggest massacre.
Neighbours told CBC News the house is owned by a former leader of the St. Thomas Annihilators and the now-defunct St. Thomas Loners motorcycle gangs.
Police would not comment on the reasons for their raid on the house, which is only a few kilometres from the farmer's field in southwestern Ontario where the bodies of eight men were found early Saturday morning.
About a dozen police cruisers were parked outside the biker's residence, while other cruisers blocked roads in the area.
Police have closed an area of 15 square kilometres around the death site while they search for clues, CBC Radio's Jean Carter said from the scene.
Aerial view of three of the four vehicles (two at top and one to the right) found as police discovered the bodies of the eight men on farmland. (Steve Martin/Canadian Press)
The eight bodies were found in and around four vehicles in a wooded area near the quiet farming village of Shedden, about 30 kilometres south of London and 200 kilometres west of Toronto.
Mass murder even stuns police
Police declined to identify the victims, saying only that they were all from the Greater Toronto Area and knew each other.
It's the biggest mass murder in recent Ontario history.
"Obviously, we're not used to having eight people at one homicide scene," Det. Supt. Ross Bingley, a spokesman for Ontario Provincial Police, said at a news conference Sunday morning.
"In 27 years of policing, I don't recall that number of people at any one location, so obviously it's fairly significant."
FROM APRIL 8, 2006: 8 bodies found in Ontario farm field
But he stressed that police wouldn't comment on the cause of death until they got more information from the coroner's office in Toronto. Autopsies were scheduled for Monday.
No names will be released until the victims' families are notified, Bingley said.
Police refuse to comment on possible gangs link
OPP also refused to discuss any possible links between the killings and organized crime, although surrounding Elgin County has a history of biker gang activity.
Several motorcycle clubs have been known to be in the area, including the Loners, Bandidos and Hells Angels.
"The Hells are present in Ontario; everybody knows that," Bingley said. "But as far as me discussing the Hells or anybody else, we're working on this murder case and we're not talking about the Hells."
A couple found the bodies on their property at about 8 a.m. EDT Saturday, just off a dirt road near Shedden.
The bodies were removed overnight and taken to Toronto.
Police seek witnesses who saw vehicles
Bingley identified the vehicles as:
A grey Pontiac Grand Prix.
A silver Infiniti sport utility vehicle. A green Chevrolet Silverado tow truck.
A silver Volkswagen Golf.
He urged anyone who may have spotted the vehicles in the area to call police.
The slayings have shocked people in Shedden, where residents told reporters they couldn't remember the last time there had been a serious crime.
Ontario Provincial Police raided a farmhouse on Sunday, continuing an investigation into what is called Ontario's "biggest massacre".

On Saturday, eight bodies were found in or around vehicles near the village of Shedden, approximately 30 kilometres from London, Ontario. Police would not identify the victims, but believed they knew each other and were from the Toronto area. They also refused to comment on any possible links between the deaths and organised crime.

Neighbours believed the house was owned by a former leader of a motorcycle gang. Police have closed off a 15 square kilometre area while they search for clues. They would not comment on the reason for the raid.