Lou Dobbs has been suggesting an NSA source for days.
There is a cyberwar going on right now, within the US government agencies themselves.
The NSA has the capability, not subject to the limitations placed on the CIA, to monitor and maintain vast databases on ALL US enterprises, as well as those of foreign governments and corporate entities. That they are diligent in rooting out threats and potential threats, is more of focus and necessary manpower, than of the power to gather and store data. NSA can’t cover everything, but they picked up on this threat.
Comes down to a distance-and-direction urination contest.