Officials are investigating an assault they say took place Tuesday at the North Dakota State Penitentiary in Bismarck.
"It is currently under investigation and at this time this is all the information we know," state Department of Corrections and Rehabilitation spokeswoman Kayli Richards said Friday.
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Information on how many staff members were assaulted, the extent of the injuries, the number of inmates involved, where in the prison the assault took place and who is investigating was not released Friday.
The prison was put on lockdown twice in January when seven correctional officers needed medical attention after being injured during assaults.