California Gov. Gavin Newsom said his state is “pulling an emergency brake” on the reopening process, placing almost all of California in the most restrictive tier due to spiraling Covid cases.

Nearly every California county has been moved backward due to a significant change in transmission statewide, Newsom said. A total of 41 counties have now moved backward to “purple,” the most restrictive tier, including Santa Barbara, Santa Clara and Alameda counties. San Francisco County is among nine more counties placed in the second-most restrictive tier due to a spike in cases. Because of the new restrictive tier, San Francisco will be closing non-essential offices and restricting capacity at gyms to 10%.

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Newsom also announced stronger mask mandates, saying masks must be worn in most cases outside of the house whenever in public, with few exceptions.

“Do not gather indoors,” said California’s top health official Dr. Mark Ghaly. “Cases today will end up in our hospital beds in 2 to 3 weeks.”

California reported 9,890 Covid cases on Sunday.

Read more at CNBC.