The FBI for the first time has added an accused domestic terrorist to its list of "most wanted" terrorism suspects.

WASHINGTON — The FBI for the first time has added an accused domestic terrorist to its list of “most wanted” terrorism suspects.

The FBI today added to the list Daniel Andreas San Diego, 31, accused of participating in animal-rights-related bombings of two corporate offices in Northern California in 2003.

San Diego, born in Berkeley, Calif., has eluded capture, the Federal Bureau of Investigation said. He isn’t believed to be in the U.S. and may be in Costa Rica, Michael Heimbach, assistant director of the FBI’s Counterterrorism Division, said at a news conference in Washington today.

San Diego was associated with an animal-rights group targeting Huntingdon Life Sciences, a unit of Life Sciences Research, according to the FBI. The bombings occurred at the Emeryville, Calif., offices of Chiron, a biotechnology company that had ties to Huntingdon, and Shaklee, a subcontractor for Huntingdon in Pleasanton, Calif., the FBI said. Chiron has since been acquired by Novartis.

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There were no injuries.

A federal arrest warrant was issued in 2003 charging San Diego with maliciously damaging and destroying and attempting to destroy buildings and other property using explosives, according to the FBI.

The FBI’s “leads have gone stale” and the bureau hopes the public will help, Heimbach said.

The most-wanted terror-suspect list on the bureau Web site now includes 24 people, including Osama bin Laden, the al-Qaida leader. The list was created after the Sept. 11 attacks. The FBI maintains a separate list of the 10 most-wanted fugitives.

San Diego is the second U.S. citizen placed on the terrorist list, according to the FBI. The first U.S. citizen is Adam Gadahn, who allegedly provided aid and comfort to al-Qaida.

San Diego has tattoos that include “progressive scenes in black and white of burning and collapsing buildings on his left abdomen,” according to the FBI’s Web site. Another tattoo says, “It only takes a spark.”

San Diego is “considered armed and dangerous,” according to the FBI. The bureau is offering a $250,000 reward for information leading to his arrest.