Update to this idiotic comment.
Via NBC:
Authorities said there were three pipe bombs tied together in a bag at the scene, and the design indicated that suspects Syed Farook and Tashfeen Malik appeared to believe their initial attack would draw a heavy law enforcement and emergency personnel response and left behind a device that would cause still greater casualties.
The device did not explode, and investigators do not know if the controller was too far away to trigger the bomb. Forensic investigation of the device has not been completed.