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How aid deliveries try to avoid bringing in Covid
Humanitarian aid has been reaching Tonga after last month's volcanic eruption and tsunami, but the South Pacific island is now in lockdown after several Covid cases were reported.
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Tonga had previously managed to stay effectively Covid-free, with just one case of infection reported last October.
What is contactless aid?
After the volcanic eruption, Tonga stressed the need for outside aid to be delivered in a "contactless" way to keep the virus out.
It's not yet known where the new cases might have come from.
"In Tonga, emergency provisions are being sent in - but personnel are not - and strict Covid protocols are followed on delivery," Aaron Davy, of the Council for International Development, in New Zealand, says.
"Even when working on the broken communication cable out at sea, the work is being done without personal contact with local people."
Aid agencies also provide assistance remotely - such as co-ordination expertise - but local authorities and community groups run the response on the ground.
Has it been done before?
Yes, there have been a number of non-contact operations in the region during the pandemic.
New Zealand delivered vaccines to Pacific Island nations by naval ship, then on helicopters or inflatable boats, before handing them over to teams on land at a distance.
Strict safety protocols - such as the wearing of protective clothing - avoided any possible transmission.
Crew members also received special training on how to handle the vaccine boxes when transferring them.
Contactless methods were also used to distribute relief supplies to Vanuatu, in the aftermath of Cyclone Harold, in April 2020.
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