Several high-security prisons in California will further restrict inmates after a spike in violence including seven homicides this year, the California Department of Corrections and Rehabilitation announced March 8.
The day before the announcement, three inmates were killed in attacks at three prisons.
The restrictions don’t include lockdowns, but modify daily activity.
Phones, tablet calls, and visiting will be temporarily restricted, according to the department.
Eleven institutions with armed perimeters and armed internal and external coverage were placed on the restrictions this week.
The facilities affected are the Calipatria, Centinela, High Desert, Kern Valley, Mule Creek, Pelican Bay, Salinas Valley, Sacramento, and Los Angeles County state prisons, the California Correctional Institution in Tehachapi, and the Substance Abuse Treatment Facility in Corcoran.
The Department of Corrections and Rehabilitation is investigating three homicides that occurred March 7.
At about 5:45 p.m. two prisoners at Kern Valley State Prison allegedly attacked another prisoner—German Merino, 37—in the day room.
Officers attempted life-saving measures but Merino died about 45 minutes later.

Suspects Gilbert Garcia, 43, and Rodolfo Cortez, 33, were placed in restrictive housing pending an investigation.
Garcia started serving an 11-year sentence for assault with a deadly weapon on Feb. 19, 2024. Cortez, who arrived in prison in 2012, is serving a 24-year sentence for two counts of second-degree robbery, one count of carjacking, and one count of assault with a deadly weapon on a peace officer.
Staff used chemical agents and non-lethal weapons to stop the attack, but Peppers died about 40 minutes later.
Officers recovered a weapon at the scene, and Shaw was placed in restrictive housing pending an investigation.
Shaw was returned to prison in 2023 after violating his parole and will serve 14 years and four months for assault with force, conspiracy to commit crime as a second striker, battery with serious injury, and possession or manufacture of a deadly weapon by a prisoner.
Peppers started serving a nine-year sentence in 2017 for second-degree robbery as a second striker, with a sentencing enhancement for inflicting great bodily injury.
Officers conducting a security check found prisoner Jake Kennedy, 32, in his cell with multiple stab wounds. Staff immediately restrained and removed his cellmate, Tyler Yates, 30, who is considered a suspect.
Kennedy died after he was taken to the prison’s triage and treatment area just after 7 a.m.
Yates started an eight-year sentence in 2017 for first-degree burglary and assault with force. On Feb. 2, 2024, he was sentenced to life with the possibility of parole for first-degree murder while in prison.
Kennedy started serving a six-year sentence in 2020 for carrying a concealed dirk or dagger as an ex-convict. On Jan. 9, 2023, he was sentenced to four years for assault by a prisoner.
The department also supervises and treats about 34,700 adults on parole and is responsible for the apprehension of those who commit parole violations.