Investigators have compiled an updated list of about 200 top Unabomber suspects, but so far the FBI isn't singling out anyone.
Left off the list are two men recent reports have suggested are possible suspects: a fugitive anti-war radical and a Symbionese Liberation Army bomber who was ac-tive in the 1970s."If we had an individual who rises to the level of significant scrutiny, at some point, the public would be advised," FBI spokesman George Grotz said.
Based on the memories of a college professor and a cryptic note found at one bombing scene, investigators have looked at numerous "Robert V's," but so far none has set bells ringing at the Unabom task force headquarters in San Francisco.
The task force has actively sought help from the public to identify and find the Unabomber by widely publishing his composite photo and setting up a toll-free line for tips - 55,000 of which have come in so far.
Grotz said there would be no reason to withhold photos or information that could help pinpoint the man who has killed three people and injured 23 others in 16 bombings since 1978.
Mark Logan, the top local Alcohol, Tobacco and Firearms official in the task force, said the evolving list of Unabomber suspects now stands at about 200.
"We have a list of people we are looking at, but the list changes daily," he cautions. The task force has had a recent series of meetings to review suspects and its focus.
The publication of the Unabomber's anti-technology manifesto has led to a spurt of media reports on possible suspects, often fugitives from radical groups of the 1960s and 1970s.
The latest was Leo Burt, 47, accused of the fatal anti-Vietnam war bombing at the University of Wisconsin Army Mathematics Research Center in August 1970. Burt went underground and two years later had his own manifesto published in the leftist journal Liberation.
Like the Unabomber, he criticized what he called the Left's bureaucratic tendencies, wanted change from below and worried about the destruction of the individual in modern society. He also bears a resemblance to the composite drawn up after the Unabomber's first fatal bombing in Salt Lake City in 1987.
A second suspect whose name continues to pop up in the media is James Kilgore, the Symbionese Liberation Army's bomb expert who also disappeared in the 1970s. The SLA, best known for kidnapping newspaper heiress Patty Hearst, had an enviro-leftist ideology similar to the Unabomber's. Kilgore reportedly used the same brand of batteries in his devices.
That doesn't make either Burt or Kilgore the Unabomber, Grotz said.
Don Davis, head of the Postal Inspection Service in San Francisco, the third agency in the task force, goes further.
"We looked at Burt and Kilgore a few years ago - we never found any reason to believe it was either of those folks," Davis said.
Behavioral psychologists said it is unlikely the Unabomber was ever a member of an organized political group - his profile is that of a loner, Davis notes.