TECUMSEH, Neb. (AP) — State prison officials have announced a lockdown at the Tecumseh State Correctional Institution after officials received information that violent attacks on staff members had been planned.

A state prisons system news release says the lockdown for units two and three was ordered at 5 p.m. Friday.

Corrections Director Scott Frakes says the lockdown was ordered because he’s not willing to risk the safety of prison staff members.

There’s been a rash of attacks on corrections officers and staff at various Nebraska prisons over several months, including one last month in Lincoln that officials say was carried about by a dozen inmates and left nine officers injured.

There will be no visits or volunteer activities allowed at the Tecumseh prison until at least Tuesday.