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"The attackers are believed to have called out their victims by name before shooting them. In one video clip, one of them is heard to shout: "We have avenged the prophet.""
Nutjobs. But religious nutjobs I'm afraid. People are driven to horrific violence by many things. These people were driven to this, at least in part, by their religion. Unless you think they were lying.
Edit: replaced "faith" with "religion".
Just in case anybody considers this a problem with Islam:
https://www.youtube.com/watch?v=yV0QXO6YfzA