WALLA WALLA, Wash. (AP) -- A unit at the Washington State Penitentiary in Walla Walla is on lockdown after a prisoner assaulted another prisoner in a common area.
Prison officials said in a statement Tuesday that the incident occurred in a close-custody living unit that houses about 187 prisoners. The injured prisoner was treated for multiple puncture wounds, but they were not life threatening.
Staff members quickly secure the unit after the incident Monday evening and transferred the suspect, 30-year-old Daniel Johnson, into a maximum-custody unit. Johnson is incarcerated on two counts of second-degree murder and has been at the prison since January.
Local law enforcement and prison staff are investigating.