The blaze that broke out Tuesday marked the second time in less than four months that the West Side house owned by Edythe London was targeted, the Los Angeles Times reported Wednesday.
London, who uses monkeys to study nicotine addiction, is a professor of psychiatry and bio-behavioral sciences at UCLA's David Geffen School of Medicine.
She wasn't home when a device left on her front porch started a fire.
FBI spokeswoman Laura Einmiller told the Times officials with the Joint Terrorism Task Force had been called in to investigate the incident along with an earlier one in which a garden hose was used to flood London's house.
No one has claimed responsibility for Tuesday's fire but Einmiller said the FBI is investigating whether the Animal Liberation Front was involved in the earlier incident.