ANAMOSA | A Mason City man serving a burglary and domestic abuse sentence in an Iowa maximum security prison was seriously injured in an assault Monday. 

Michael Waddington, 31, was found unresponsive in the kitchen area of Anamosa State Penitentiary around 5:44 p.m. Monday, the Iowa Department of Corrections said in a news release. Anamosa is about 25 miles northeast of Cedar Rapids. 

Waddington was transported by ambulance to a regional medical center before being transferred to University of Iowa Hospital and Clinics, where "serious injuries from an altercation are being treated," the Department of Corrections said. He remains hospitalized. 

Waddington was sentenced to up to 15 years in prison in 2013 after pleading guilty to three felonies: second-degree burglary, domestic abuse by strangulation resulting in bodily injury and willful injury resulting in bodily injury. 

The charges stemmed from an altercation in 2012 in which Waddington was accused of punching a person in the face. 

Claude Breese, who is serving a sentence for drugs, was the other inmate involved in the altercation, according to the Department of Corrections. All others believed to have been involved have been segregated, and a full investigation is underway. 

No staff were injured in the incident.