One of the suspects fatally shot himself as police moved in to arrest him and an American suspect confessed to the plot when she was arrested at the Halifax airport, a senior police official told The Associated Press.
Police and Canadian Justice Minister Peter MacKay said the plot was not related to terrorism.
"This appeared to be a group of murderous misfits," MacKay said today. "The attack does not appear to have been culturally motivated, therefore not linked to terrorism."
Nova Scotia RCMP Commanding Officer Brian Brennan said the suspects planned to go to the Halifax Shopping Center and kill as many people as they could today, Valentine's Day, before taking their own lives.
He told a news conference that police found three long-barrel rifles in the home of a third suspect, a 19-year-old who died before he could be arrested. He did not elaborate on how the suspect died.
The American woman was arrested at the Halifax airport and confessed to the plot, the official said, adding that she had prepared a number of pronouncements to be tweeted after her death. Shepard was also arrested at the airport as he waited for his friend's arrival.
The suspects used a chat stream and were apparently obsessed with death and had many photos of mass killings, said the official, speaking on condition of anonymity because he was not authorized to speak publically.
MacKay credited police for their quick action.
At the home of the male suspect, police saw two people leave the house who they determined were the 19-year-old's parents and pulled them over on a traffic check. They then called the suspect.
The man told police that he didn't have any guns, but shot himself as he was on his way out of the house, the official told the AP.
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