Los Angeles, California -- -- The FBI and University of California at Los Angeles police are investigating a new round of threats from anti-animal research activists who say they sent AIDS-tainted razor blades and a threatening message to a research professor, a university spokesman said Tuesday. The university said law enforcement officials confirmed that UCLA neuroscientist David Jentsch received a package at his home containing razor blades and a threatening note. No other details about the package or its contents were given by the university.