A United States marine has tested positive for coronavirus after arriving in Australia two weeks ago.
The marine, 25, who is asymptomatic, arrived in Darwin on April 12 as part of the US Rotational Force based in the Northern Territory.
He tested positive for COVID-19 in the past 24 hours.
Three other people have also tested positive.
They include a one-year-old boy and two women aged 36 and 46 who arrived on a repatriation flight from New Delhi on April 17.
They and the marine are now in quarantine in the NT Centre for National Resilience at Howard Springs, near Darwin International Airport.
Since repatriation flights to the NT began in October, 6,669 international arrivals have been taken to Howard Springs.
Of those, 121 have tested positive for COVID-19.