President-elect Donald Trump is tweeting about the Berlin Christmas market attack, arguing it represented a "purely religious threat."

Twelve people were killed and 48 were injured when a man drove a truck into a crowded outdoor market on Monday. A 24-year-old suspect from Tunisia, Anis Amri, was killed Friday morning by police in Milan after he drew a weapon when approached by police.

Amri appeared to have posted a video prior to the attack on social media in which he talked about slaughtering crusaders who had come to kill Muslims.

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