TECUMSEH, Neb. (AP) — Nebraska corrections officials believe other inmates likely killed two prisoners who died during a disturbance at a maximum security prison in southeast Nebraska. The state Department of Correctional Services says Donald Peacock and Shon Collins were found dead Monday as officials regained control of the Tecumseh State Correctional Institution. Both were 46.

Corrections Director Scott Frakes declined to release details of their deaths, which are under investigation.

Peacock and Collins were serving lengthy sentences for child-sex crimes. Peacock had been incarcerated since March 2014 and was serving a sentence of 40 to 50 years. Collins had been in prison since May, 2010 and was serving 66 to 80 years.

Speaking at a news conference, Frakes said 100 to 200 of the roughly 1,000 inmates at the prison were involved in the disturbance that began Sunday afternoon in front of a housing unit at the prison. Two prison staffers were assaulted in the initial disturbance. Frakes says one inmate was shot in the leg by a tower guard, and another inmate was injured by a rubber projectile.

The facility is located about 40 miles west of Rock Port, Mo. The prison is expected to remain on lockdown status until further notice.