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BERLIN, GERMANY - DECEMBER 20:  The Brandenburg Gate stands illuminated in the colors of the German flag the day before a truck drove into a crowded Christmas market in the city center 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:  The Brandenburg Gate stands illuminated in the colors of the German flag the day before a truck drove into a crowded Christmas market in the city center 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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Mourners form human chain to honor Berlin attack victims

Crowds gathered to mourn the lives lost when a truck plowed into a Berlin Christmas market, killing 12.

Mourners form human chain to honor Berlin attack victims

Crowds gathered to mourn the lives lost when a truck plowed into a Berlin Christmas market, killing 12.