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SAN BERNARDINO, CA - DECEMBER 03:  Law enforcement officials investigate around the Ford SUV vehicle that was the scene where suspects of the shooting at the Inland Regional Center were killed on December 3, 2015 in San Bernardino, California. Police continue to investigate a mass shooting at the Inland Regional Center in San Bernardino that left at least 14 people dead and another 17 injured on December 2nd.  (Photo by Joe Raedle/Getty Images)
SAN BERNARDINO, CA - DECEMBER 03:  Law enforcement officials investigate around the Ford SUV vehicle that was the scene where suspects of the shooting at the Inland Regional Center were killed on December 3, 2015 in San Bernardino, California. Police continue to investigate a mass shooting at the Inland Regional Center in San Bernardino that left at least 14 people dead and another 17 injured on December 2nd.  (Photo by Joe Raedle/Getty Images)

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    What was the motive behind the San Bernardino shooting?

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What was the motive behind the San Bernardino shooting?

Brian Levin of the Center for the Study of Hate & Extremism discusses factors that may have led to the deadly mass shooting in San Bernardino, California.

What was the motive behind the San Bernardino shooting?

Brian Levin of the Center for the Study of Hate & Extremism discusses factors that may have led to the deadly mass shooting in San Bernardino, California.