LINCOLN, Neb. (AP) — Nebraska’s state corrections director says a prison struck by a weekend riot will remain under lockdown until the threat of further disturbances has passed.

Director Scott Frakes said in a memo released Friday that the Tecumseh State Correctional Institution’s lockdown will depend on good behavior and how quickly repairs can be made to facilities.

Inmates took control of part of the prison on Sunday. Two inmates were killed. Prison officials have said both men were likely killed by other inmates. Lawmakers said Thursday that fire, water and structural damage from the chaos could total $350,000 to $500,000. Insurance will likely cover the expense.

Some lawmakers have said the upheaval may have stemmed from inmate complaints about a lack of programing. Frakes promised inmates improvements but says they’ll take time.