Australia's second largest city, Melbourne, reinstated Covid-19 restrictions as authorities scrambled to find the missing link in a fresh outbreak, prompting New Zealand to pause a "travel bubble" with the state of Victoria.
Amid worries the cluster, which has grown to nine cases in two days, could spark a major outbreak, Victoria imposed social restrictions and made face masks mandatory in hotels, restaurants, and other indoor venues from 6pm local time until 4 June.
The latest outbreak ends Victoria's run of zero cases for nearly three months and saw New Zealand suspend quarantine-free travel with the state and the neighbouring state of South Australia impose travel restrictions.