Originally posted by the Voice of America. Voice of America content is produced by the Voice of America, a United States federal government-sponsored entity, and is in the public domain. Australia on High Alert as Sydney COVID-19 Cluster Grows Phil Mercer SYDNEY - Tougher controls have been put in place as Australia fights to contain a growing COVID-19 cluster in Sydney. Travel from the nation's biggest city is being restricted as authorities race to find he source of 83 recently diagnosed infections, up from 68 on Sunday. About 250,000 residents in Sydney's northern beaches district have been ordered to stay-at-home until at least Wednesday after a cluster of new COVID-19 infections was discovered. The source of the cluster is not yet known, but officials believe it is likely to have come from a traveler returning from the United States, possibly a member of a flight crew. .