Los Angeles , California ( CNN ) -- The FBI and University of California at Los Angeles police are investigating a new round of threats from anti-animal research activists who claimed to have 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 . The North American Animal Liberation Press Office posted an unsigned communique on its website from a group calling itself `` The Justice Department at UCLA , '' claiming its members sent the razor blades to Jentsch because he uses primates for government-funded testing of drug addiction . `` He has no business addicting primates to phencyclidine known on the streets as PCP and other street drugs using grant money from the federal government , '' said the statement issued Tuesday by the activist group . Since 2006 , other anonymous activists claimed responsibility for at least 11 acts of sabotage , vandalism , criminal damage and firebombing against UCLA faculty or property , either on and off campus , university officials said . In March 2009 , activists seeking to stop the use of animals in research claimed to set fire to Jentsch 's vehicle parked overnight outside his home . Jentsch , a professor of psychology , psychiatry and biobehavioral sciences , uses vervet monkeys in his research into the biochemical processes that contribute to methamphetamine addiction and tobacco dependence in teenagers , and the cognitive disabilities affecting schizophrenia patients , according to the university . Much of Jentsch 's work is funded by the National Institutes of Health , university officials said . `` Responsible use of animals in research aimed at improving the health and welfare of the mentally ill is the right thing to do , and we will continue because we have a moral responsibility to society to use our skills for the betterment of the world , '' Jentsch said in a statement . In a phone interview with CNN , Jentsch said the activists have been `` using various tactics to get at me . '' `` They started with incinerating my car , '' he said . `` They have participated in monthly demonstrations outside of my house . Usually the threats are general , this one was very specific . `` They said they were going to cut my throat , and they named one of my students . `` I 'm not afraid . I 'm angry . It 's so ridiculous in our society that people do this just because they do n't like what you do , '' he added . Jentsch provided an account of the threat . `` About a week ago I was going through my mail in my kitchen and I opened a letter and razor blades spilled out on the floor . It was the first sign something was nefarious , '' he said . `` The letter inside contained quite specific and heinous acts of violence to kill me . '' He said the letter was signed by the Justice Department , which he described as a group `` loosely aligned with the Animal Liberation Front . '' `` The major reason [ no one has been arrested ] is because the Animal Liberation Front has no official membership . Their spokesman calls from underground and claims to not know any of its members , '' Jentsch said . Jerry Vlasak , an animal rights activist , said he does not know who targeted Jentsch but he says he understands why the researcher was targeted . `` He does not have the right to go home to feel at ease . Try to look at it from the perspective of the innocent beings that he is doing this to , '' Vlasak said . Vlasak says he is a medical doctor who also used to do animal research but stopped because he felt it was incredibly torturous to animals . `` He has refused to debate with me and other doctors . He has spoken out against animal activists . So he has basically made himself an even bigger target , by saying not only am I going to continue torturing animals but I am flipping the bird to all these animal rights activist that want to stop me , '' Vlasak said . University spokesman Phil Hampton condemned the threats . `` What 's happened here recently is only the recent manifestation of a pattern of reprehensible , repugnant criminal activity directed at UCLA researchers , '' Hampton said . `` UCLA is committed to conducting research that helps us to understand better the human body and is making important steps and strides to new diagnoses , treatments and cures to a wide variety of ailments such as Parkinson 's ( disease ) and cancer . '' CNN 's Nick Valencia contributed to this report .
Researcher says , `` I 'm not afraid . I 'm angry '' Anti-animal research activists make new round of threats against researcher . Score: 6 UCLA researcher uses vervet monkeys for drug addiction studies .