Investigators in western Canada are seeking to unravel what caused a depressed man to kill eight people – including two children – then commit suicide.
The killings took place between Monday and Tuesday in the city of Edmonton, in Alberta province, leaving residents of the city reeling.
Investigators said the killings were carried out by a man of Vietnamese origin who had been living in Canada for a long time and had a lengthy criminal past.
He went into a home and shot and killed Cindy Duong, 37, on Monday then travelled to a different part of the city and used a handgun to kill seven other people in a different home.
Edmonton police chief Rod Knecht said the attack was planned, deliberate and the worst mass killing in the city’s history.
“In my 39 years of policing, I’ve never seen anything like it,” he said.
“It’s chaotic, horrific,” he added when referring to the crime scene. “This a horrific event for the city.”
According to police, the suspect co-owned the house where the seven people were killed.
The bodies of two children less than 10 years old were found there, along with the corpses of three women and two men aged between 25 and 50.
After the presumed killer carried out the attacks, he drove to a Vietnamese restaurant in Fort Saskatchewan, a north-eastern suburb of Edmonton, and killed himself.
Authorities indicated the suspect had a business interest in the restaurant.
The man was 57, according to local media. Police have not yet released his name.
The tragedy is being classed as domestic violence, though police have not yet disclosed how the victims and the perpetrator were related.
Investigators said the man had a history of police contacts dating back to 1987, including for domestic violence and sexual assault. He was also in deep financial distress.
Authorities plan to only release the identities of the other victims and the killer after autopsy results are available.
The killings were carried out with a handgun stolen in neighbouring British Colombia in 2006, police said.
Mass killings and gun crime are relatively rare in Canada compared to neighbouring United States where gun ownership is much more widespread.