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Video from the Chinese port-city of Zhoushan neighbouring Shanghai shows the sky turned blood-red under thick layers of fog.
Panic could be heard in the voices of the residents as they recorded the discolored horizon, stirring apocalyptic fears.
The crimson sky was most prominent by the port, prompting worries that a fire had got out of control.
The red sky became a top trending topics on China's Twitter-like social media, Sina Weibo, attracting more than 150 million views.
On Douyin, China's version of TikTok, users called the red sky a bad omen over China's handling of the Covid-19 pandemic, resurgent in neighbouring Shanghai.
One user said it means: 'Accidents will happen', with another adding. 'I started to stock up on supplies.'
But local media explained the strange weather phenomena was not a sign of Armageddon but in fact a result of light refraction.