Daniel Andreas San Diego, now 47, is fighting extradition from the UK amid accusations he set off three pipe bombs in 2003

Twenty-two years ago, a dark-haired, bespectacled young man vanished off the streets of San Francisco. Daniel Andreas San Diego, a 25-year-old information technology specialist, diehard vegan and animal rights activist, was the FBI’s main suspect in a series of pipe bombings that exploded in front of the headquarters of Chiron Corporation and Shaklee Corporation, two Bay Area companies, in August and September of 2003.

Communiques attributed to the Revolutionary Cells – Animal Liberation Brigade were posted to the website of an animal rights magazine, claiming the attacks were carried out to highlight both firms’ alleged work with Huntingdon Life Sciences, a British research company that conducted tests for pharmaceutical, biotechnology and other chemical companies and had drawn the ire of activists on both sides of the Atlantic opposing its tests on animals.