California Gov. Gavin Newsom on Thursday announced a one-month curfew to combat the rising spread of COVID-19.

Newsom tweeted that the curfew would go into effect Saturday beginning at 10 p.m. and last for the next month. Gatherings and nonessential work will be prohibited from 10 p.m. to 5 a.m. in purple-tier counties.

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“The virus is spreading at a pace we haven’t seen since the start of this pandemic and the next several days and weeks will be critical to stop the surge. We are sounding the alarm,” Newsom said in a statement. “It is crucial that we act to decrease transmission and slow hospitalizations before the death count surges. We’ve done it before and we must do it again.”

On Monday, Newsom announced that 41 of California’s 58 counties would be moved to the purple tier category. Last week California became the second U.S. state after Texas to surpass 1 million coronavirus cases.

Newsom faced significant backlash over the past week for attending a 12-person birthday party for his adviser at a Napa Valley restaurant just as California became the second state to reach 1 million COVID-19 cases.

Read more at The Hill.