"At this stage, we do not yet know why the terrible event occurred," Obama said.
California shooting suspect identified as Syed Farook: media
"We don't know at this point the extent of their plans. We do not know their motivations.
"It is possible that this was terrorist-related. But we don't know. It's also possible that this was workplace-related," the president said.
At least 14 dead in shooting at California disabled center
He also ordered flags on government buildings, embassies and military installations to be flown at half-staff until Monday, following the incident that killed at least 14 people.
The order came in a presidential proclamation issued to "honor the victims of the attack in San Bernardino, California."
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