The fighting, which reportedly involved stone-throwing and batons rather than bullets, occurred Monday night. It follows weeks of scuffles between Indian and Chinese troops along the border.
The Chinese capital closed some markets, locked down parts of the city and banned outsiders from some neighborhoods after finding links between a massive wholesale market and a spate of new cases.
The video conferencing company says Beijing had asked that four meetings and associated users be terminated. Two of the users were based in the U.S. and the third in Hong Kong.
Measures to mitigate the coronavirus pandemic have devastated China's economy, shutting factories and urban jobs that millions of migrant workers depend upon. Many now seek jobs in their villages.
After years of U.S. criticism about human rights, China's Communist Party has seized on protests sparked by George Floyd's death to spread propaganda about what it calls American "double standards."
On Friday, President Trump said he would sever ties — and funding — to the World Health Organization because of its relationship with China. On Monday, WHO offers its first official response.
Hong Kong is supposed to be a semiautonomous enclave of China, "one country, two systems." But China is moving to impose a sweeping national security law on the city, which critics say is illegal.