Two new COVID-19 cases have been recorded in ships docked in Western Australian ports.
One case has been reported on the bulk carrier Key Integrity from Manila in the Philippines, off the coast of Geraldton.
And the Unites Arab Emirates live export ship Al Messilah, currently in Fremantle, has also recorded a case.
Health Minister Roger Cook said the trend was "deeply concerning", after four ships with coronavirus-positive crew members had arrived in Western Australian waters in the past three weeks.
The state government is afraid COVID-19 infections are slipping through the cracks, and is demanding the Commonwealth do more.
Mr Cook told the government to "get off your butt" and enforce stronger standards with overseas countries.