Authorities in China have placed a city on lockdown as the country battles to prevent a second wave of the potentially deadly coronavirus.
The city of Harbin in northern China has become the latest hotspot after a woman unknowingly infected 70 others after testing negative for Covid-19.
A 22-year-old student surnamed Han had returned to China from New York last month. She had gone through a 14-day quarantine and showed no symptoms of the bug.
Harbin health authorities say she was a "silent carrier" of the virus. Unaware, she went on to infect her neighbours who then hosted a gathering.