Two inmates at Arizona's Lewis Prison in Buckeye set fire to a mattress in their cell Thursday, Arizona Department of Corrections officials said.
Staff evacuated all inmates in the surrounding cells and quickly extinguished the fire, said ADC spokesman Bill Lamoreaux.
No one was hurt.
The two inmates that set the fire and two officers were taken to a local hospital for possible minor smoke inhalation, Lamoreaux said. Their conditions are not known.
The fire damaged the mattress and some inmate property in the cell.
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