(CNN) A North Carolina prison complex where an inmate died from Covid-19 Saturday has the highest number of coronavirus cases of any federal correctional complex in the United States, according to the Federal Bureau of Prisons (BOP).

Sixty inmates and 23 staff have tested positive for Covid-19 at the Butner Correctional Complex, according to BOP data. The complex is made up of one low security institution, two medium security institutions and a medical center.

The first death from coronavirus at the Butner complex occurred on Saturday night, the BOP said. The 81-year-old inmate in the medium-security Butner FCI 1 facility had pre-existing medical conditions and had been serving a 99-year sentence.

Staff at the Butner complex were given two surgical masks April 6 and will receive two more masks this Monday, a BOP spokesperson said. Inmates at Butner were given one surgical face mask last week, and will receive a cloth face mask this Monday.

Both staff and inmates are required to wear the face masks any time social distancing is not possible, and inmates are screened by medical staff before coming out of their cells, the spokesperson said.

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