In addition to determining the motive, police will have to find out how the 18-year-old got the firearm used in the attack in a country whose gun control system is described by the U.S. Congress Library as being "among the most stringent in Europe.".
The father of a victim shows a picture of his son near the Olympia shopping center where a shooting took place leaving nine people dead the day before on Saturday, July 23, 2016 in Munich, Germany. (AP Photo/Sebatian Widmann) The Associated Press
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