Homegrown Terror

(Fox News) - FBI officials say the most dangerous domestic terror groups in the U.S. might not be Islamic extremists — but radical environmental and animal rights groups.

Recently-released excerpts of the National Intelligence Estimate say Americans can expect attacks from "single issue" groups within the next three years. In the past the FBI has said these include animal-rights and environmental groups.

Cybercast News reports a FBI counterterrorism official says actions such as the bombing of two California companies with ties to animal research in 2003 are part of "a relentless campaign of terror and intimidation." And a spokesman with the North American Animal Liberation group says the movement will use — "any means necessary" to stop animal torture — including violence.