It's reported police in Hawaii are investigating two fires lit by inmates at an overcrowded prison.
The Honolulu Star-Bulletin reports four workers and an inmate were treated for the effects of smoke inhalation after prisoners at the Hawaii Community Correctional Centre started a fire at the weekend.
The newspaper reports the Department of Public Safety official, Ed Shimoda, as saying some inmates began fighting after officials moved them from their cells.
Mr Shimoda said at least one correctional officer fired a shotgun as a warning.
On the day of the fires, the prison had 2-hundred and 11 inmates, well surpassing the official capacity of 1-hundred and 20.