TORONTO (AP) — A gunman disguised as a police officer went on a 12-hour rampage in the Canadian province of Nova Scotia, shooting people in their homes, setting fires and killing at least 18 people, including a policewoman, in the deadliest mass shooting in the country’s history.

Officials said the suspect, identified as 51-year-old Gabriel Wortman, was also among the dead in the weekend attack. Police did not provide a motive for the killings.

Canadian Prime Minister Justin Trudeau said the gunman killed at least 18.

"How could this happen? We may never know why," Trudeau told a news conference. "But we do know this. No one man's action can build a wall between us and a better day — no matter how evil, how thoughtless or how destructive."

Trudeau asked the media to avoid mentioning the name of the assailant or showing his picture.

"Do not give this person the gift of infamy," Trudeau said.

Police began advising residents overnight Saturday in the rural town of Portapique, about 60 miles (100 kilometers) north of Halifax, to lock their doors and stay in their basements.

Several bodies were later found inside and outside one home on Portapique Beach Road, the street where the suspect lived, authorities said.

Bodies were also found at several other locations within about a 50-kilometer (30-mile) area from the neighborhood where the shootings began late Saturday, and authorities believe the shooter may have targeted his first victims but then began attacking randomly. Several homes in the area were set on fire.

At least four white forensic vans were seen Monday morning entering the neighborhood where the shootings began.

Authorities said the suspected gunman wore a police uniform at one point and made his car look like a Royal Canadian Mounted Police cruiser.

"That fact that this individual had a uniform and a police car at his disposal certainly speaks to it not being a random act," Mounted Police Chief Superintendent Chris Leather said. He said many of the victims did not know the shooter and authorities believe he acted alone.

According to his high school yearbook, Wortman long had a fascination with the Mounties."Gabe's future may including being an RCMP officer," the yearbook profile said.

The dead officer was identified as Constable Heidi Stevenson, a mother of two and a 23-year veteran of the force. Another officer was wounded.

Also among the dead was school teacher Lisa McCully, who worked at a local elementary school. Nova Scotia Teachers Union President President Paul Wozney said. "Our hearts are broken along with those of her colleagues and students at Debert Elementary," he said.

Two health care workers at local nursing homes were also among those killed, according to Von Canada, a long term health care company, which identified them as Heather O'Brien, a licensed practical nurse, and Kristen Beaton, a continuing care assistant.

Wortman, who owned a denture practice in in the city of Dartmouth, near Halifax, lived part time in Portatipique, according to residents of the town.

Police initially said Wortman had been arrested Sunday at a gas station in Enfield, outside Halifax, but later said he had died. It was not clear how, and they did not provide further details, although one police official said that there was an exchange of gunfire between the suspect and police at one point.

Cpl. Lisa Croteau, a spokeswoman with the provincial force, said police received a call about "a person with firearms" late Saturday night, and the investigation "evolved into an active shooting investigation."

Christine Mills, a resident of the area, said it had been a frightening night for the small town, with armed officers patrolling the streets. In the morning, helicopters flew overhead searching for the suspect. "It's nerve-wracking because you don't know if somebody has lost their mind and is going to beat in your front door," she said.

Tom Taggart, a lawmaker who represents the Portapique area in the Municipality of Colchester, said the quiet community has been shaken.

"This is just an absolutely wonderful, peaceful quiet community and the idea that this could happen in our community is unbelievable," Taggart said. He said he didn't know Wortman well, but spoke to him a few times when he phoned about municipal issues and described knowing Wortman's "lovely big home" on Portapique Beach Road.

Wortman is listed as a denturist — a person who makes dentures — in the city of Dartmouth, near Halifax, according to the Denturist Society of Nova Scotia website. Atlantic Denture Clinic, the practice Wortman owned, was closed for the past month because of the coronavirus pandemic.

Leather, the police superintendent, said authorities were investigating whether the attack had anything to do with the coronavirus pandemic but no link has been found thus far.

Mass shootings are relatively rare in Canada. The country overhauled its gun-control laws after gunman Marc Lepine killed 14 women and himself at Montreal's Ecole Polytechnique college in 1989. Before this weekend's rampage, that had been the country's worst mass killing.

It is illegal to possess an unregistered handgun or any kind of rapid-fire weapon in Canada. The country also requires training, a personal risk assessment, two references, spousal notification and criminal record checks to purchase a weapon.

Another mass shooting two years ago in Toronto left 10 people dead and 16 wounded. The suspect, who said he carried out the attack in retribution for years of sexual rejection and ridicule by women, is awaiting trial.

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