(Rocco Luka Magnotta, 29, is a suspect in the discovery of a man's torso in Montreal.) (CNN) -- The search continued Thursday for a gay porn actor suspected of dismembering his acquaintance, posting the video of the incident online and mailing the severed limbs to different locations in Ottawa, including to a political party's headquarters, according to a source with direct knowledge of the investigation. Authorities are searching for Luka Rocco Magnotta, 29, who they allege is responsible for a human torso discovered in Montreal, thought to be linked to a human hand and foot that were separately mailed from...