San Diego was detained by officers from the National Crime Agency, supported by Counter Terrorism Policing and North Wales Police, at a property in a rural area next to woodland in Conwy, north Wales, on November 25 last year.
Daniel Andreas San Diego was one of the agency’s “most wanted fugitives” after bombings in San Francisco, California, in 2003.
The FBI previously said that San Diego, who was born in Berkeley, California, has “ties” to an animal rights extremist group and there was a reward of 250,000 dollars (£198,000) for information leading directly to his arrest.
The 47-year-old wore a grey prison-issue t-shirt and tracksuit bottoms, and spoke to confirm his personal details when he appeared in the dock at Westminster Magistrates’ Court on Monday for a case management hearing as he fights extradition to the US.
On August 28 2003, two bombs exploded about one hour apart on the campus of a biotechnology corporation in Emeryville, the agency said.
