Kaczynski was transferred on Dec. 14 from the supermax prison in Florence, Colo., where he was serving multiple life-in-prison sentences, to FMC Butner, a federal medical center in North Carolina, said spokeswoman Kristie Breshears.

She declined to provide details of Kaczynski’s condition. David Kaczynski, Ted Kaczynski’s brother, said he had been told recently by someone who corresponds with his brother that he had been moved to a different facility, but the Bureau of Prisons declined to tell him why that was. David Kaczynski, who tipped the FBI to his brother as a possible suspect, said his brother does not respond to his letters.

Kaczynski, 79, pleaded guilty in 1998 to carrying out mail bombings in a deranged campaign against modern technology.

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