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SAN BERNARDINO, CA - DECEMBER 2: San Bernardino police offices in SWAT gear secure the scene where a mass shooting occurred at the Inland Regional Center on December 2, 2105 in San Bernardino, California. Multiple fatalities and injuries were reported as police search for up to three suspects who are still at large. (Photo by Gina Ferazzi / Los Angeles Times via Getty Images)
SAN BERNARDINO, CA - DECEMBER 2: San Bernardino police offices in SWAT gear secure the scene where a mass shooting occurred at the Inland Regional Center on December 2, 2105 in San Bernardino, California. Multiple fatalities and injuries were reported as police search for up to three suspects who are still at large. (Photo by Gina Ferazzi / Los Angeles Times via Getty Images)

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    Police: San Bernardino shooters 'were on a mission'

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Police: San Bernardino shooters 'were on a mission'

San Bernardino Police Chief Jarrod Burguan says the people responsible for the mass shooting at the Inland Regional Center were very prepared and on a mission.

Police: San Bernardino shooters 'were on a mission'

San Bernardino Police Chief Jarrod Burguan says the people responsible for the mass shooting at the Inland Regional Center were very prepared and on a mission.