CNN Wire Staff
(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.
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