(CNN) "Unabomber" Ted Kaczynski has been moved to a federal medical center in North Carolina, according to the Federal Bureau of Prisons.
"Theodore John Kaczynski is in the custody of the Federal Bureau of Prisons (BOP) at the Federal Medical Center (FMC) Butner," a statement from BOP says.
Kaczynski, 79, is serving eight life sentences after he pleaded guilty in 1998 for sending bombs that killed three people and wounded 23 others through the mail from 1978 to 1995.
Kaczynski had been held at Supermax in Florence, Colorado, before he was transferred to FMC Butner on December 14.
FMC Butner is a federal medical center for inmates, according to its website, though BOP said, "for safety and security reasons, we do not discuss the specific conditions of an inmate's confinement, to include medical information or reasons for transfer/redesignation."