(CNN) Anger and criticism over China's unrelenting zero-Covid policy has erupted after a bus transporting residents to a coronavirus quarantine facility crashed on Sunday, killing 27 people. It is unclear why a quarantine bus would take people on winding mountain roads after midnight. Other photos and videos show the bus being towed by a truck, its top crushed, and a hazmat suited worker spraying disinfectant on it. While CNN cannot independently verify the photos and videos, the bus license plate in the images matches the plate number reported by authorities. Survivors of the crash are now receiving treatment in hospital, according to authorities.

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