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SAN BERNARDINO, CA - DECEMBER 03:  FBI agents and local law enforcement examine the crime scene where suspects of 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. (Photo by Sean M. Haffey/Getty Images)
SAN BERNARDINO, CA - DECEMBER 03:  FBI agents and local law enforcement examine the crime scene where suspects of 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. (Photo by Sean M. Haffey/Getty Images)

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    FBI investigating shootings as an 'act of terrorism'

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FBI investigating shootings as an 'act of terrorism'

Authorities say they are investigating the San Bernardino attacks as an "act of terrorism." If confirmed, it would be the worst terrorist incident in the U.S. since 9/11. CNN's Pamela Brown reports.

FBI investigating shootings as an 'act of terrorism'

Authorities say they are investigating the San Bernardino attacks as an "act of terrorism." If confirmed, it would be the worst terrorist incident in the U.S. since 9/11. CNN's Pamela Brown reports.