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BERLIN, GERMANY - DECEMBER 23: A couple eat french fries near a police armoured vehicle near the Brandenburg Gate prior to a concert there on December 23, 2016 in Berlin, Germany. German authorities remain on high alert following the shooting of terror suspect Anis Amri by Italian police in Milan. Amri, who is thought to be the driver who drove a truck into a Berlin Christmas market on December 19, killing 12 people and injuring dozens, possibly had accomplices in the Berlin Islamist scene. (Photo by Sean Gallup/Getty Images)

BERLIN, GERMANY - DECEMBER 23:  A couple eat french fries near a police armoured vehicle near the Brandenburg Gate prior to a concert there on December 23, 2016 in Berlin, Germany. German authorities remain on high alert following the shooting of terror suspect Anis Amri by Italian police in Milan. Amri, who is thought to be the driver who drove a truck into a Berlin Christmas market on December 19, killing 12 people and injuring dozens, possibly had accomplices in the Berlin Islamist scene.  (Photo by Sean Gallup/Getty Images)