The police and federal authorities are investigating two bombings that targeted two scientists at the University of California, Santa Cruz, the latest in a series of attacks against biomedical researchers who conduct experiments on animals, officials say.

The bombings took place practically at the same time early Saturday, just a few days after the police in Santa Cruz found leaflets in a coffee shop warning of assaults against “animal abusers everywhere.” The pamphlets enclosed the names, addresses and other personal details of some researchers at the university, according to a news release issued on Friday by the university, as reported by the New York Times.

On Saturday at about 5.30 a.m., two small bombs went off outside the researchers’ residences. In one of the blasts, an automobile was damaged in the university member’s driveway. In the other attack, on a two-story house close to the university’s front gates, the flames forced the researcher, his spouse and his two children to escape their home from an upstairs window. However, the fires were rapidly put out.

The Santa Cruz Sentinel informed that only one minor injury was reported and that the police were considering the attacks had been acts of attempted homicide and domestic terrorism.

The researcher whose house ignited was identified by The Associated Press as David Feldheim, a molecular biologist, who was named in the pamphlet. Nonetheless, the other researcher’s identity was not disclosed, but authorities said that the person’s name had not been listed in the pamphlet.

The university depicted the attacks as the most recent in a series of menaces and provocations from those against “biomedical research using animals,” including an incident that occurred in February, when numerous covered intruders broke into a researcher’s home.

Police said they intended to increase security for UC Santa Cruz researchers whose names had been listed in the pamphlets discovered last week, The Associated Press reported.