Michael McCaul, the Republican chair of the House homeland security committee:

Terrorism has gone viral.

Jason Healey, a senior fellow at the Atlantic Council's Cyber Statecraft Initiative:

[This is] the most dangerous cyber moment that I can remember [in two decades].

James Comey:

The Internet is the most dangerous parking lot imaginable.

Stan Stahl, president of of the Los Angeles chapter of the Information Systems Security Association:

It's staggering, the number of people who will click on a link to get the free Amazon gift card. It's kind of scary.

Former FBI assistant director Thomas Fuentes:

You know, it's my opposite of Jesse Jackson's 'Keep Hope Alive' -- it's 'Keep Fear Alive.' Keep it alive.

Iain Thomson:

Advanced Threat Analytics constantly scrutinizes your office network, and uses basic machine learning techniques to identify suspicious behavior by devices and users, and raise the alarm if necessary.

Barack Obama:

I ... hereby declare a national emergency ...

Ben Thompson:

Wouldn't it be better if we never got to the moment of crisis at all?