LINCOLN, Neb. (AP) — The Nebraska Department of Correctional Services has released a plan outlining steps officials will take in the wake of a May prison riot that left two inmates dead and heavily damaged the state prison at Tecumseh. But officials say there remains much work to be done.

The Nebraska State Patrol still has not completed its separate criminal investigations. Johnson County Attorney Rick Smith said Thursday the State Patrol’s investigation into the two deaths is still ongoing. He hasn’t yet filed charges for documented assaults on prison guards, criminal mischief to parts of the prison or for the killings.

The plan released Thursday by corrections director Scott Frakes pulls directly from steps listed in a June 29 incident report detailing how the May 10 riot unfolded. The steps include an analysis of prison staff, additional staff training and drills, reviewing responses to prison disturbances and even buying “new weapon resistant mops and brooms.”

The plan also calls for recommendations on how to hand out over-the-counter medication to prisoners. Officials have said the rampage by several hundred inmates started when too many prisoners were allowed to leave their cells at once to get medication.