Anis Amri attended mosque hours after carrying out his deadly attack Monday on a Berlin Christmas market that left 12 dead and dozens injured, but there was nothing especially pious about the 24-year-old Tunisian before or even after he was radicalized.

On Friday morning, Islamic State (IS) propagandists posted a video of Amri calling for revenge attacks on Muslim-bombing“crusaders” and pledgingallegiance to their leader, Abu Bakr al-Baghdadi.

Prior to Monday’s attack, Amri pursued an unruly, secular life of petty crime and vandalism.

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