Domestic terrorism is defined by Section 2331 of Title 18 of the United States Code as follows:
- Involves acts dangerous to human life that are a violation of the criminal laws of the United States or of any State;
Appear to be intended--
- to intimidate or coerce a civilian population;
- to influence the policy of a government by intimidation or coercion; or
- to affect the conduct of a government by mass destruction, assassination, or kidnapping; and occur primarily within the territorial jurisdiction of the United States.
Animal rights activist calls firebombing of researchers ‘necessary’
"A University of California-Santa Cruz biologist whose home was firebombed this weekend feared for his family’s future, while a spokesman for a radical animal rights group said the attacks were the consequences for performing research on animals.
The volatile rhetoric left the University of California-Santa Cruz on edge Sunday, a day after a pair of firebombings on two university biomedical researchers had authorities looking for clues and tightening security around researchers. FBI officials were expected to join the search Monday, in what authorities have called an act of “domestic terrorism.”
Just before 6 a.m. Saturday, molecular biologist David Feldheim’s home was firebombed, forcing him, his wife and their two young children to flee down a fire escape. About the same time, a car belonging to a different, unidentified researcher was destroyed by another firebomb. Police described the explosives as a “Molotov cocktail on steroids,” and said the attack on the Feldheims’ house was being investigated as an attempted homicide because the family was at home.
The Santa Cruz Police Department said it was “unconscionable” for anyone to defend such acts. 
“To put this on par with any of the human rights issues is an absolute insult to the integrity of the people who fought and went through the human rights movement,” said Capt. Steve Clark" Capt. Clark went on to say:
|“||This is what people do when they have an inability to articulate their point in any constructive way. They resort to primal acts of violence. Any reasonable person would need a logic transplant to begin to understand this level of degraded thinking.||”|