Thirteen new COVID-19 cases have been detected in Western Australia, including a dozen crew members from a ship docked at Fremantle.
WA Health said 12 of 22 crew from an oil and chemical tanker at Fremantle Port had returned positive tests for COVID-19.
The captain of the Stolt Sakura notified WA Health of 12 non-negative rapid antigen tests on Tuesday, and the ship berthed at Fremantle Port on Saturday morning to allow public health officials to test all members.
Twelve crew members in total have tested positive by PCR test, a statement on the WA Health website said on Sunday.
"Four crew members have now been transferred by ambulance to Fiona Stanley Hospital, two are in ICU, one in a serious but stable condition and one is in a stable condition. The other two crew members are in a stable condition."
The ship travelled from Singapore, according to the VesselFinder site.
A man in his 30s who was self-quarantining with his family in a serviced apartment in Northbridge, Perth, has also tested positive, WA Health confirmed.
The family of three returned travellers were taken by ambulance to a quarantine facility on Saturday after the man tested positive.
A number of close contacts are being managed by public health officials.
And travellers on a Virgin flight from Adelaide to Perth on Friday are being contacted after Adelaide Airport was listed as an exposure site.
The total number of coronavirus cases in WA stands at 1099. To date, 1085 people have recovered.
As of 8pm on Saturday night night, WA Health was monitoring five active COVID-19 cases.