A corrections officer at Rikers Island has been stabbed at least 15 times by an inmate in what officials are calling an “unprovoked, heinous and callous attack” on one of their officers.The incident occurred at approximately 4:45 p.m. on Monday afternoon when a male corrections officer working in the protective custody unit was reportedly attacked by an inmate, according to a statement obtained by ABC News’ New York City station WABC."Earlier today, while working in the protective custody unit at the Anna M.Kross Center, one of our Correction Officers was brutally stabbed in the back of his head approximately 15 times by an inmate," COBA President Benny Boscio said in the statement obtained by WABC.The corrections officer who was attacked was immediately taken to Elmhurst Hospital and is currently listed in stable condition, according to WABC."This was an unprovoked heinous and callous attack on one of our dedicated officers, who was simply doing their job," DOC Commissioner Louis Molina said in a statement."