The Federal Bureau of Investigation on Friday announced  the arrests of four people charged with harassing and endangering University of California researchers who work with animals. In one incident, those arrested are charged with trying to enter the home of a researcher in Santa Cruz. In another incident, three of those arrested have been linked to fliers that publicized the home addresses and personal information of university researchers who work with animals – two of whom then had firebombs left at their homes. “With so many legal options to make their voices heard … it is inexcusable and cowardly for these people to resort to terrorizing the families of those with whom they do not agree,” said Charlene B. Thornton, special agent in charge of the FBI’s San Francisco office, in a statement. The Animal Liberation Press Office sent an e-mail to reporters saying that those arrested had engaged only in peaceful and legal protest.