The prison officer was assaulted with a homemade weapon, according to the North Carolina Department of Correction.
Officials won't say exactly what the weapon was or how it was used, or what specific injuries were inflicted on the guard who was treated and released from WakeMed. They did say the guard's injuries weren't life threatening.
"It's volatile every day you go to work. You have to be aware," said Pamela Walker, with the N.C. Division of Adult Correction. "You have to be very alert at all times. It's a dangerous job and something that they encounter on a daily basis."
Recently several inmates at Central Prison claimed that guards beat them badly while they were restrained and out of the view of surveillance cameras. They have an active lawsuit in federal court.
"We've asked the SBI to come in and investigate," said Walker. "So they're handling that portion of it and hopefully will get to the bottom of what the reasoning was. Sometimes there's no reason at all."
Neither the identity of the guard nor the inmate has been released.