Police shot and killed a gunman who held three hostages for several hours Wednesday at the Discovery Communications building in Silver Spring, Md., authorities said.
They said the hostages were safe.
At least one explosive device on his body went off when he was shot, and other explosive devices could still be in the building in Montgomery County in suburban Washington, D.C.
The man, James Jay Lee, 43, was a longtime protester at the building.
Included in a manifesto by Mr. Lee:
“Nothing is more important than saving ... the Lions, Tigers, Giraffes, Elephants, Froggies, Turtles, Apes, Raccoons, Beetles, Ants, Sharks, Bears, and, of course, the Squirrels. The humans? The planet does not need humans.”
Lee said he experienced an ‘‘awakening” when he watched former Vice President Al Gore’s environmental documentary ‘‘An Inconvenient Truth."