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MUNICH, GERMANY - JULY 22:  A mobile care and help center is erected in a parking area of a Kentucky Fried Chicken near the Olympia Einkaufzentrum (OEZ) after a shooting at the shopping mall on July 22, 2015 in Munich, Germany. According to reports, nine people have been killed and an unknown number injured in a shooting at a shopping centre in the north-western Moosach district in Munich. (Photo by Joerg Koch/Getty Images)
MUNICH, GERMANY - JULY 22:  A mobile care and help center is erected in a parking area of a Kentucky Fried Chicken near the Olympia Einkaufzentrum (OEZ) after a shooting at the shopping mall on July 22, 2015 in Munich, Germany. According to reports, nine people have been killed and an unknown number injured in a shooting at a shopping centre in the north-western Moosach district in Munich. (Photo by Joerg Koch/Getty Images)

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Brian Levin, from the Center for the Study of Hate and Extremism, talks to CNN's Natalie Allen about the Munich shooter's possible motivations.

Understanding the Munich shooter

Brian Levin, from the Center for the Study of Hate and Extremism, talks to CNN's Natalie Allen about the Munich shooter's possible motivations.