The Tecumseh State Correctional Institution was placed in a lockdown at 5 p.m. Friday, according to a press release.
The release states that staff received information indicating violent attacks on staff members had been planned.
"This information strongly suggests our staff members' safety is at risk," Corrections Director Scott Frakes said in the press release. "That's not a risk I'm willing to take."
Housing units two and three were placed on lockdown, while housing unit one and the special management unit are in modified operations status.
"Typically, modified operations are in response to an incident," Tecumseh Warden Brad Hansen said in the press release. "In this case, however, it is a proactive step taken to ensure TSCI operates without serious incident.
"The safety of my staff is my first priority."
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There will be no visits or volunteer activities allowed at TSCI until Tuesday. An announcement will be made Tuesday regarding future visits and activities.