Is the government still searching for a motive?
Of course.
"FBI officials continued to analyze computer evidence Friday to determine the motive behind a shooting massacre that claimed the lives of 14 people and injured nearly two dozen others in San Benardino."
http://losangeles.cbslocal.com/2015/12/04/investigation-heightens-to-determine-motive-of-san-bernardino-shooting-massacre/