SA urges travellers in NSW to return home as Victoria and NT tighten border controls South Australia is urging residents holidaying in NSW to consider returning home as soon as possible as Sydney's coronavirus outbreak spreads. Nine of today's new cases are linked to the Avalon cluster but another six were found in the Croydon area in Sydney's inner west. Three cases remain under investigation. Croydon is the latest suburb to be considered a coronavirus hotspot after a new cluster emerged there.(Rhett Wyman/SMH) NSW Health this afternoon added venues across Sydney, the Blue Mountains and the Illawarra to its virus warning list as areas visited by confirmed COVID-19 cases.