Kent Institution was in lockdown on Wednesday, following an inmate disturbance.
Officials have not released any further information as of press time.
The incident at the maximum-security federal penitentiary occurred at about 8 a.m. on May 30.
As is usual when there is an incident at the prison, visits were suspended until further notice.
"In order to improve its practices and reduce future incidents, CSC will continue to work in an effort to review the circumstances surrounding the disturbance and take action where necessary," a media release stated Wednesday afternoon.