The day before state authorities announced plans to restrict inmate movement and revoke visits and other privileges, three inmates were killed in attacks at three different prisons.

High-security prisons across California have tightly restricted movement, calls and visits while officials probe a surge in violence this year. The restrictions started Saturday and affect the top-security sections of nearly a dozen lockups including the California Correctional Institution,

(FOX40.COM) –The California Department of Corrections and Rehabilitation is taking additional security measures in response to a surge in violence against staff and inmates. On Saturday, officials announced the placement of high-security sections,