FILE - In this Aug. 26, 2020, file photo, the federal prison complex in Terre Haute, Ind.
The lockdown at more than 120 federal Bureau of Prisons facilities took effect at 12 a.m. Saturday, according to an email to employees from the president of the union representing federal correctional officers.
During a lockdown, inmates are kept in their cells most of the day and visiting is canceled.
As the pandemic continues to menace federal inmates and staff, a federal lockup in Mendota, California, is also dealing with a possible case of tuberculosis.
As of Wednesday, the last day for which data was available, there were 4,718 federal inmates and 2,049 Bureau of Prisons staff members with current positive tests for COVID-19.