Peruvian authorities moved jailed New Yorker Lori Berenson to a capital prison to treat a chronic back ailment that could complicate her five-month-old pregnancy.
Prison spokeswoman Janet Sanchez says prison facilities and doctors in Lima are better equipped to treat herniated disks in Berenson's back. Her pregnancy is not in immediate danger.
Berenson arrived at the Lima prison Friday after traveling by bus from the northern province of Cajamarca.
Sanchez would not say whether the transfer is permanent.
The 39-year-old American, who married a member of the Tupac Amaru guerrilla group whom she met in jail, is serving 20 years for collaborating with leftist rebels in the 1990s. She is scheduled for release in 2015.