"A number of prisoners have been relocated as a precautionary measure after routine testing revealed higher than normal levels of radon," a spokesperson for the prison was quoted as saying by the broadcaster.
The report added that the relocation of inmates is a "temporary measure" amid work to "permanently reduce" radon levels in the building.
According to the broadcaster, the increase in radiation levels could be caused by the high concentration of granite in the air.
(With UNI Inputs)