The National Post reports a Facebook page believed to belong to the suspect, 22 year-old Matthew de Grood, featured an ominous status update not long before the attack.

"Dread and the fugitive mind - the world needs a hero," was posted at Monday at 7:39 p.m. The first part of the quote is the name of a Megadeth song followed by the title of the 2001 album it came from.