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A fight at the Oregon State Penitentiary started Friday night and continued into Saturday morning.

(Oregonian/OregonLive file photo)

Update: Police are investigating the death of an inmate.

SALEM -- State officials say the Oregon State Penitentiary is on lockdown after more than 150 inmates broke out in fights Friday.

According to the Statesman Journal, fights broke out Friday afternoon and continued onto Saturday morning. The Oregon Department of Corrections says an investigation has been opened into what caused fight and official did not say if the fights were gang related.

The penitentiary has placed 155 inmates in solitary confinement for their involvement in the fights. Five inmates needed medical attention for injuries that weren't life-threatening. No staff was injured.

The Oregon State Penitentiary is the state's only maximum security prison and houses more than 2,000 male inmates. The prison was first established in 1866.

-- The Associated Press