These kinds of actions will flag some attention from federal agencies like the FBI and NSA and the penalties for bomb threats are much higher than minor infringements like blackmailing porn surfers. 
All the three lettered agencies will surely be involved with this especially the CIA which will consider this threat as terrorism. But I doubt they will take email threats like this seriously, I mean surely they are getting thousands of these kinds of email threats everyday to several states in the US and they won't see this vague email as a real threat. They would only consider this email as a way of a person on how they will extort money out of it but not a threat to the life of U.S. citizens. 
