Hundreds of inmates were involved in a riot at an Arizona prison Wednesday — with guards hitting the group with rubber bullets and tear gas, according to reports.

The incident occurred at Eyman prison in Florence in the afternoon, which remained on lockdown into the evening because “several hundred inmates grouped together around staff and refused to disperse,” the Arizona Republic reported.

One inmate described the scene to local station KJZZ as a “war zone” and claimed prisoners were attacked by the staff.

“They came in with tear gas, flash bangs, pepper spray, and started shooting them at everyone,” the inmate said. “It was basically a war zone.”

No injuries have been reported among staff members or inmates.

It’s unclear what caused the melee, but KJZZ reported the inmates previously complained about the condition inside the lockup.