In yet another terror attack in Europe, an assailant plowed a tractor-trailer through a Christmas marketplace in Berlin, killing 12 and injuring 48. 

Police thought they had arrested the attacker, a 23-year-old Pakistani man, but Reuters reports that he has since been released. 

On "Outnumbered" today, the panel reacted to this latest attack, which bore all the hallmarks of July's Nice, France attack.

They also discussed the shocking assassination of the Russian ambassador in Turkey, where an off-duty policeman yelled, "Do not forget Aleppo!" before opening fire.

Discussing the Berlin attack, Steve Hayes and Meghan McCain agreed that German Chancellor Angela Merkel's liberal policies toward welcoming refugees appear to have increased the overall threat level. 

McCain said this attack looks like the "new normal" and called Merkel "patient zero" because of her policies on refugees. 

"The ramifications for the last eight years of progressive policies - not only in this country but globally as well - this is the chickens coming home to roost. If I'm a German right now and I can't even go to a Christmas festival, I would be furious," said McCain. 

She then wondered whether Merkel - up for re-election next year - will be the latest progressive world leader to be defeated based on the pushback to these policies.

Lisa Boothe pointed out that President-elect Donald Trump will enter office with "destabilization" and increasing threats across the world. 

Watch the full discussion above.

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