A police officer places a candle at a makeshift memorial in Berlin on December 20.
A woman is illuminated by candles as she cries in Berlin on December 20.
A man prays at a Berlin memorial on December 20.
German Chancellor Angela Merkel lays flowers at the memorial on December 20. She is joined by, from left, Berlin Mayor Michael Muller, Minister of the Interior Thomas de Maiziere and Foreign Minister Frank-Walter Steinmeier.
Merkel, bottom left, views the scene of the attack.
A woman reacts near the crime scene on December 20.
Mourners gather at the Kaiser Wilhelm Memorial Church near the crash site.
A police officer holds her weapon near the market.
A woman lays flowers at a makeshift memorial across from the market.