A suspected double bomber on the FBI's most wanted list who vanished for 21 years is due in court this week to decide if he will be sent back to the United States to face trial.

The FBI believes Daniel Andreas San Diego has links to animal rights extremist groups and is their prime suspect for a series of bombings in the San Francisco Bay Area in 2003.

Former FBI agents have stated there were missed opportunities to arrest the 47-year-old before he vanished and claim they found a suspected bomb-making factory in his abandoned car after what detectives described as a 65-mile rush-hour chase in California.

San Diego was located 5,000 miles away in a cottage in north Wales last year.

The former fugitive, who had a $250,000 bounty on his head, faces a five-day extradition hearing at Westminster Magistrates Court in London on Monday to determine if the UK will hand him over to the United States to answer a federal arrest warrant.

The first-born American on the FBI's most wanted terrorist list, San Diego has been indicted for maliciously damaging and destroying by means of explosives tied to two attacks in 2003, conducted by the animal rights extremist group Revolutionary Cells - Animal Liberation Brigade.

Investigators believe that the two bombs, one targeting a biotechnology firm and the other aiming at first responders, were designed to promote an animal rights agenda. Former agents expressed frustration over missed chances for his arrest, especially after monitoring him closely.

After San Diego made a frantic escape from surveillance and wasn't seen for two decades, he was eventually tracked down in Wales. He was arrested by the UK's National Crime Agency on November 21, 2024.

FBI Director Christopher Wray remarked that San Diego's capture illustrates the agency's long-term commitment to seeking justice, regardless of the time elapsed.