Daniel Andreas San Diego, a long-time FBI fugitive and the agency's prime suspect in a series of 2003 bombings in the San Francisco Bay Area, is due to appear at Westminster Magistrates Court this week for a five-day extradition hearing.
San Diego, who was arrested in November after living covertly in north Wales, faces a US federal arrest warrant that could see him returned to the United States to face charges related to the bombings. The FBI has linked him to animal rights extremist groups and has said he is a suspect in several attacks in 2003.
US authorities say San Diego vanished after a 65-mile rush-hour chase in California that ended when he abandoned a car investigators later described as containing a suspected "bomb-making factory." Former FBI agents have told reporters there were "missed opportunities" to arrest him during the investigation that followed the 2003 incidents.
San Diego, who had been on the FBI's most wanted list and carried a $250,000 (£199,000) reward, was traced to a cottage in north Wales before his arrest in November 2024. British police cooperated with US authorities in the operation that led to his detention, officials said.
The extradition hearing, scheduled to last five days, will determine whether the United Kingdom will hand San Diego over to face the federal warrant. If the court finds the legal conditions for extradition are met, the final decision will rest with the UK Home Secretary, who will consider the court's findings and any representations against surrender.
Court proceedings in extradition cases commonly focus on whether the paperwork and legal standards are satisfied, whether the offences are extraditable, and whether there are any bars to surrender, such as human rights considerations. Defence lawyers in such cases often challenge the sufficiency of the supporting documentation and may argue that extradition would be oppressive or otherwise unjust.
The alleged 2003 bombings targeted institutions connected to biotechnology and research in the San Francisco Bay Area, according to US accounts. Authorities have previously described the attacks as part of a campaign by extremist animal rights activists, though prosecutions in these matters can be complex and protracted.
San Diego was 47 at the time of his arrest. He had lived for years as a fugitive, moving across jurisdictions and changing his identity, according to law enforcement summaries released during the hunt for him. The FBI placed him on its most wanted list and publicised the bounty in the hope of securing information that would lead to his capture.
Legal experts say extradition hearings of this length allow both sides time to examine documents, hear witness testimony where relevant, and argue legal points before a magistrate decides whether the statutory tests for extradition have been met. If the court orders surrender, the Home Secretary will consider any remaining legal obstacles before making a final decision.
The case has drawn renewed attention to the 2003 incidents and to the long-running efforts by US and international authorities to pursue suspects who cross borders. Media reports on the arrest noted the remote nature of the north Wales property and the long interval between the alleged offences and San Diego's capture.
No trial date in the United States has been set. The Westminster hearing will resolve the immediate question of whether San Diego will be handed over to US custody to face the federal charges outlined in the arrest warrant.