LANSING, Kan. (AP) – The Kansas Department of Corrections says the maximum-security unit at the state’s largest prison is on lockdown after “altercations” involving inmates and staff.

Corrections spokesman Adam Pfannenstiel said in an email Friday the maximum-security unit at the Lansing Correctional Facility is on lockdown after four “separate incidents” early Thursday. He described the incidents as “altercations initiated by inmates against staff.”

He says there were no serious injuries, and the incidents appear unrelated.

During the lockdown, which will be reevaluated Tuesday, inmates will remain in their cells and won’t move throughout the facility. Visitation for the maximum-security unit is also canceled during the lockdown.

The Leavenworth Times reports the lockdown comes as Sam Cline became the prison’s new warden last week, replacing former Warden Rex Pryor, who retired.