California corrections officials say high-security prisons across the state are tightly restricting movement, calls and visits while they probe a surge in violence this year.

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,