LINCOLN, Neb. (AP) — Nebraska’s corrections director says a formal investigation into a prison riot last month is nearly complete.

Director Scott Frakes said Wednesday that he hopes to have the final report by the end of this week.

The review was launched after a May 10 prisoner uprising at the Tecumseh State Correctional Institution that left two inmates dead. Death certificates from the state say Donald Peacock and Shon Collins died of blunt force trauma to the head.

Frakes says the prison remains on lockdown, although inmates have been allowed to have visitors and some access to outdoor recreation yards. He says he hopes to have final damage from the disturbance cleaned up in the next three weeks.