CNN:

The man believed to be holding at least one hostage at the Discovery Channel headquarters in Silver Spring, Maryland, has been identified as James Lee, a law enforcement source tells CNN.
Lee is an environmental protester who has been publishing criticisms of the network, according to a senior law enforcement official close to the investigation.
An angry manifesto posted on a website called SaveThePlanetProtest.com repeatedly refers to humans as “filth” and demands that the Discovery Channel “stop encouraging the birth of any more parasitic human infants.”
“Civilization must be exposed for the filth it is,” the 1,149-word statement says.
“Humans are the most destructive, filthy, pollutive creatures around and are wrecking what’s left of the planet with their false morals and breeding culture,” it continues.
Lee also blasts immigration, farming, weapons of mass destruction, automotive pollution “and the whole blasted human economy.”

And now watch this: I will not link this crazed lunatic to the environmental movement at large. See how easy it is? Hopefully the Left will remember this the next time a crazed lunatic from the Right does something horrific.