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An online video shows a man who looks like Mr. Magnotta committing violent acts against kittens. The video contains at least one photo made available by Montreal police Wednesday that identified the man as Mr. Magnotta. For nearly two years, Mr. Magnotta’s name has been notorious among animal-rights activists looking for a man who tortured and killed cats and posted videos of it online.

Police discovered the severed foot Tuesday after Jenni Bryne, a top political adviser to Prime Minister Stephen Harper, opened a bloodstained box at Conservative Party headquarters.

When Ms. Bryne opened the box, a foul odor overcame the office.

“It was such a horrible odor. I’m sure many of us will not forget it,” Conservative Party spokesman Fred DeLorey said.

Police said the package was addressed to the Conservative Party of Canada and not to a specific person.

Rob Gillies reported from Toronto.