Okay, so if it exists, you should have an easy time sourcing it, right? Because nobody yet has actually sourced it. The best anyone has put forward is a website claiming "we asked the government and they totally said it was real" before they linked to something completely different.
Terrorism: The use of violence and fear to achieve an ideological aim.
Leftists want gun control and are willing to kill masses of innocent people to drive political change.
The media is their partner, and so is any government agency that aids in the carnage.