From CTV News:
A man armed with a large knife walked into Saint Joseph’s Oratory during Mass Friday and attacked a priest.
The Mass was being recorded for Sel+Lumiere TV, which streams the religious ceremony daily, but the video was quickly removed from the website. The video showed that at 8:40 a.m. a man wearing a dark winter coat and a light-colored baseball cap pulled out a large knife as he walked in front of the altar, then ran up the steps toward a priest. [This is where Saint Andre Bessette served.]