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,

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.

(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,