NEW YORK, Nov. 6 -- Authorities say the publishing of the UNABOMber's 35,000-word manifesto has helped alter their profile of the serial bomber. The New York Times reported Monday that law enforcement officials now believe the person who has killed three and injured 22 others since 1978 is a student of sociology, rather than mathematics or computer science as they originally believed. They also have changed their earlier view that the bomber was a terrorist with a political agenda, now believing that the criminal better fits the description of a serial killer who kills and maims to satisfy a deep psychological need. The UNABOMber sent a letter to the New York Times earlier this year saying that the bombings would stop if his treatise was published in a major newspaper. The manifesto against the evils of technology was published in late June by the New York Times and the Washington Post, but authorities say the world has not heard the last of the UNABOMber. 'This guy is a serial killer,' former FBI serial crime unit head John Douglas told the Times. 'He's not going to go away. He'll look for some excuse, some evil that will cause him to do this again.' Some academics who have studied the manifesto are convinced the work is that of a frustrated social scientist. 'He uses social science terminology with a sure hand,' said University of Wisconsin professor David Lindberg, who is president of the History of Science Society.
But others say the bomber may not be a scholar at all, just an intelligent person who could have picked up his ideas hanging around gathering places in academic communities. Since 1978, the FBI-nicknamed UNABOMber has mailed or placed 15 bombs in California, Connecticut, Illinois, Michigan, Tennessee, Utah, and Washington, and despite an intensive effort by the FBI, has remained at large and unidentified. And despite 20,000 phone tips to the FBI since June and the efforts of dozens of agents, investigators say they are no closer to solving the 17-year-long string of bombings. After a pair of bombs maimed researchers at Yale and the University of California, San Francisco, last year, the FBI established a $1 million reward for any information leading to the bomber's arrest. The most recent attack of the UNABOMber took place in April when timber industry lobbyist Gilbert Murray was killed by a package bomb at his Sacramento office. On the same day as the bombing, the UNABOMber mailed a letter from Oakland to the New York Times claiming responsibility for the attack. Federal agents have developed a profile of the bomber: likely a white male, 30-40 years of age, a loner with at least a high school education. Previously, the bomber has targeted universities, professors, airline executives or computer stores. He or she uses the initials 'FC' in what authorities believe is a succinct description of his feelings about computers.