BEIJING, China (AFP) — Authorities in China cancelled hundreds of flights, closed schools and ramped up mass testing on Thursday to try and stamp out a new Covid-19 outbreak linked to a group of tourists. Beijing has maintained a relentless zero-Covid approach with strict border closures and targeted lockdowns, even as other countries tentatively try to ease restrictions. Domestic outbreaks have largely been eliminated, but as China logged a fifth straight day of new cases […]