China's industrial and tech hub of Xian reported on Thursday more than 100 new cases of Covid-19, taking its tally of locally transmitted infections to the highest in any Chinese city this year.

Xian reported 155 new local cases for Dec 29, official data showed. That takes its number of local infections to more than 1,100 since the flare-up began on Dec 9 and compelled authorities to put the city of 13 million under lockdown.