The suspect, Leo F. Burt, has evaded capture since the anti-Vietnam War bombing at the University of Wisconsin, which was considered the largest act of domestic terrorism at the time.
In the more than 50 years since a bomb ripped through a mathematics center at the University of Wisconsin, killing a graduate student and injuring several others in what was considered an attack protesting the Vietnam War, the F.B.I. has received hundreds of tips about the whereabouts of one of the suspects, Leo F. Burt.
Just weeks after the attack on Aug. 24, 1970, a waitress in Cleveland was convinced that she had seen him. Years later, another tipster thought he had spotted Mr. Burt at a homeless shelter in Denver. One man said he had seen the fugitive working at a resort in Costa Rica. But Mr. Burt was never found.
