9 staff have resigned since inmate revolt at Nebraska prison; facility badly understaffed

Nebraska Gov. Pete Ricketts walks past a sign for the Tecumseh State Correctional Institution following a tour of the facility in Tecumseh, Neb., Tuesday, May 19, 2015. The tour took place a little more than a week after a riot at the prison left two inmates dead. (AP Photo/Nati Harnik) (The Associated Press)

Nebraska Gov. Pete Ricketts is seen through bars during a tour of the Tecumseh State Correctional Institution in Tecumseh, Neb., Tuesday, May 19, 2015. The tour took place a little more than a week after a riot at the prison left two inmates dead. (AP Photo/Nati Harnik) (The Associated Press)

Nebraska Gov. Pete Ricketts, third left, is accompanied by Warden Brian Gage, in white shirt, during a tour of the Tecumseh State Correctional Institution in Tecumseh, Neb., Tuesday, May 19, 2015. The tour took place a little more than a week after a riot at the prison left two inmates dead. (AP Photo/Nati Harnik) (The Associated Press)

Nine staff members have quit a Nebraska maximum security prison since inmates revolted last week and temporarily took over part of the facility, leaving two prisoners dead.

Officials allowed media inside the prison for the first time on Tuesday. Warden Brian Gage told Gov. Pete Ricketts that in addition to the staff who resigned after the May 10 disturbance, 40 other staff positions are unfilled.

Gage says the facility's rural location 70 miles south of Omaha makes it difficult to recruit and retain older, experienced staff.

Officials say the disturbance began after officers confronted an inmate who was in the yard but was supposed to be on room restriction, and the prisoner refused to cooperate.

An investigation is underway. The 960-bed facility remains on "modified lockdown" with limited inmate mobility.