WALLA WALLA, Wash. (AP) — Two large fights led to a lockdown at the Washington State Penitentiary Walla Walla.

Prison spokeswoman Shari Hall tells the Union-Bulletin that the fights happened about an hour apart on Christmas morning. Both were in the outside recreation yard at the prison's West Complex.

Hall says one inmate suffered a significant injury that required hospitalization; others sustained no more than bumps and bruises. No correctional officers were injured.

The prisoners were from of the four close-custody units in the West Complex. That unit was on lockdown Monday with visiting canceled.

The rest of the prison was operating as usual.