Cologne's police chief has said the perpetrators appeared to be of "Arab or North African" origin.
"We all agreed that Schengen and free movement must be safeguarded."
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The year's most powerful images from Reuters photographers around the world.
Half of those arriving were Syrians fleeing the war, another 20 percent were Afghans, and 7 percent were Iraqis
The Guardian named Reuters photographer Yannis Behrakis as their 2015 photographer of the year.
The German government sees a European asylum law - alongside securing Europe's external borders - as key to reducing the number...
The annual message is sent to heads of state and government as well as international organizations such as the United Nations...
Thousands of migrants have been blocked in Greece following a decision by several European nations to only allow transit through their borders to...
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