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BERLIN, GERMANY - DECEMBER 20: Security and rescue workers tend to the area after a lorry truck ploughed through a Christmas market on December 20, 2016 in Berlin, Germany. So far 12 people are confirmed dead and 45 injured. Authorities have confirmed they believe the incident was an attack and have arrested a Pakistani man who they believe was the driver of the truck and who had fled immediately after the attack. Among the dead are a Polish man who was found on the passenger seat of the truck. Police are investigating the possibility that the truck, which belongs to a Polish trucking company, was stolen yesterday morning. . (Photo by Michele Tantussi/Getty Images)

BERLIN, GERMANY - DECEMBER 20: Security and rescue workers tend to the area after a lorry truck ploughed through a Christmas market on December 20, 2016 in Berlin, Germany. So far 12 people are confirmed dead and 45 injured. Authorities have confirmed they believe the incident was an attack and have arrested a Pakistani man who they believe was the driver of the truck and who had fled immediately after the attack. Among the dead are a Polish man who was found on the passenger seat of the truck. Police are investigating the possibility that the truck, which belongs to a Polish trucking company, was stolen yesterday morning. . (Photo by Michele Tantussi/Getty Images)
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BERLIN, GERMANY - DECEMBER 19: Rescue workers push a person on a stretcher in the area after a lorry truck ploughed through a Christmas market on December 19, 2016 in Berlin, Germany. Several people have died while dozens have been injured as police investigate the attack at a market outside the Kaiser Wilhelm Memorial Church on the Kurfuerstendamm and whether it is linked to a terrorist plot. (Photo by Sean Gallup/Getty Images)

BERLIN, GERMANY - DECEMBER 19: Rescue workers push a person on a stretcher in the area after a lorry truck ploughed through a Christmas market on December 19, 2016 in Berlin, Germany. Several people have died while dozens have been injured as police investigate the attack at a market outside the Kaiser Wilhelm Memorial Church on the Kurfuerstendamm and whether it is linked to a terrorist plot. (Photo by Sean Gallup/Getty Images)
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Getty Images News Sean Gallup

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BERLIN, GERMANY - DECEMBER 20: Workers from the Christmas market congregate in a restricted area near where yesterday a lorry ploughed through a Christmas market on December 20, 2016 in Berlin, Germany. So far 12 people are confirmed dead and 45 injured. Authorities have confirmed they believe the incident was an attack and have arrested a Pakistani man who they believe was the driver of the truck and who had fled immediately after the attack. Among the dead are a Polish man who was found on the passenger seat of the truck. Police are investigating the possibility that the truck, which belongs to a Polish trucking company, was stolen yesterday morning. (Photo by Sean Gallup/Getty Images)

BERLIN, GERMANY - DECEMBER 20: Workers from the Christmas market congregate in a restricted area near where yesterday a lorry ploughed through a Christmas market on December 20, 2016 in Berlin, Germany. So far 12 people are confirmed dead and 45 injured. Authorities have confirmed they believe the incident was an attack and have arrested a Pakistani man who they believe was the driver of the truck and who had fled immediately after the attack. Among the dead are a Polish man who was found on the passenger seat of the truck. Police are investigating the possibility that the truck, which belongs to a Polish trucking company, was stolen yesterday morning. (Photo by Sean Gallup/Getty Images)
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Getty Images News Sean Gallup

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BERLIN, GERMANY - DECEMBER 20: Workers from the Christmas market stalls enter a restricted area to lay flowers where yesterday a lorry ploughed through a Christmas market on December 20, 2016 in Berlin, Germany. Several people have died while dozens have been injured as police investigate the attack at a market outside the Kaiser Wilhelm Memorial Church on the Kurfuerstendamm and whether it is linked to a terrorist plot. (Photo by Sean Gallup/Getty Images)

BERLIN, GERMANY - DECEMBER 20: Workers from the Christmas market stalls enter a restricted area to lay flowers where yesterday a lorry ploughed through a Christmas market on December 20, 2016 in Berlin, Germany. Several people have died while dozens have been injured as police investigate the attack at a market outside the Kaiser Wilhelm Memorial Church on the Kurfuerstendamm and whether it is linked to a terrorist plot. (Photo by Sean Gallup/Getty Images)
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Getty Images News Sean Gallup

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BERLIN, GERMANY - DECEMBER 20: Workers from the Christmas market stalls enter a restricted area to lay flowers where yesterday a lorry ploughed through a Christmas market on December 20, 2016 in Berlin, Germany. Several people have died while dozens have been injured as police investigate the attack at a market outside the Kaiser Wilhelm Memorial Church on the Kurfuerstendamm and whether it is linked to a terrorist plot. (Photo by Sean Gallup/Getty Images)

BERLIN, GERMANY - DECEMBER 20: Workers from the Christmas market stalls enter a restricted area to lay flowers where yesterday a lorry ploughed through a Christmas market on December 20, 2016 in Berlin, Germany. Several people have died while dozens have been injured as police investigate the attack at a market outside the Kaiser Wilhelm Memorial Church on the Kurfuerstendamm and whether it is linked to a terrorist plot. (Photo by Sean Gallup/Getty Images)
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Getty Images News Sean Gallup