More than 100 inmates had to be temporarily moved after the fire broke out in a cottage at the Edna Mahan Correctional Facility for Women in Clinton Township on Sunday.
Corrections Department spokesman Matt Schuman tells The Star-Ledger of Newark smoke was rising from the cottage's heating ducts.
The cause of the fire is under investigation.
The prison holds roughly 850 female inmates.
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Information from: The Star-Ledger, http://www.nj.com/starledger