Police in northeastern China said that seven people have been arrested following a clash between residents and authorities enforcing COVID-19 quarantine restrictions. The violence comes as China reports new cases nationwide, with 2,230 cases reported Tuesday in the southern manufacturing and technology hub of Guangzhou.

While the numbers remain relatively low, China has relentlessly pursued its strict “zero-COVID” policy of quarantines, lockdowns and daily or near-daily compulsory testing. A news release from the police department in the Shandong city of Linyi said public security would take strong measures against those who “illegally violated the legal rights of personal protection of citizens.”

Anti-pandemic measures have prompted backlashes across the country, forming a rarely seen challenge to Communist Party authority. It wasn’t immediately clear who was arrested after the clash. News of the arrests appeared on social media Tuesday morning, but were erased by the country’s censors before noon. Chinese leader Xi Jinping has made “zero-COVID” a hallmark of his administration, which gained a boost last month after he was granted a third five-year term in power and promoted loyalists to top positions.

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