Candles for the victims of yesterday's attack on Berlin's Christmas market sit outside a Zara clothing fashion store, operated by Inditex SA, in Berlin, Germany, on Wednesday, Dec. 21, 2016. German investigators intensified their search for the perpetrator of a deadly truck assault on a Christmas market in Berlin after an initial suspect was released, deepening the fear and uncertainty over what Chancellor Angela Merkel called a terrorist act. Photographer: Jasper Juinen/Bloomberg via Getty Images
