The FBI has accused him of being “an animal rights extremist”.
The first bombing was in August 2003 with two explosions an hour apart on the campus of a biotechnology company, followed by a nail bomb at a nutritional products company a month later, the FBI said.
He became the first “domestic terrorist” to be added to the agency’s most wanted terrorist list, saying he “should be considered armed and dangerous”.
The FBI also said he was “skilled at sailing, and has travelled internationally”.
Michael J Heimbach, the FBI’s assistant director of the counterterrorism division, said the suspect had committed “domestic acts of terror planned out and possibly intended to take lives, destroy property and create economic hardship for the companies involved”.
It offered a reward of $250,000 (£199,000) for information leading to his arrest, saying he could have been living in Costa Rica.
According to reports, the agency’s last sighting of him was in 2003, when FBI agents were close in downtown San Francisco.
“He parked his car, got out of his vehicle and started walking down the street and if I’m not mistaken, he went into a Bart [train] station and that was the last time we’ve seen him,” David Johnson, an FBI agent, said in 2013.
Andrew Black, a former FBI agent, said the case at the time was “of great interest” to the bureau.
“We had recently solved the Unabomber investigation, and bombings were a serious concern to the FBI and trying to solve them,” he told CBS news.
