New Zealand Police will talk to people who made comments on a Chinese social media site encouraging others to arm themselves and form vigilante groups.
The Herald has been told that more than 10 groups have been formed through the platform WeChat, with members based by location.
Sign up to our daily Covid-19 newsletter for essential advice and a full summary of the day's news and developments. Register or sign in here and select Top News Stories
A perceived rise in anti-Chinese sentiments over the Covid-19 outbreak was one of the reasons for the formation of the groups, one member told the Herald.
Counties Manukau Police Inspector Wendy Spiller said police were aware of some of the comments.
She warned that anyone making threats online could face prosecution under the Harmful Digital Communications Act.
"We ask anyone who is aware of concerning content online, which threatens the safety of themselves or others, to contact police," she said.
"Police also want to reassure the community that we will have an increased presence on the streets conducting regular patrols to check that those people out in public over this period have an essential reason for doing so."
One group member told the Herald there had been an increase in online attacks against the Chinese in recent days, and the groups were a way of "protecting ourselves".
She said the groups also supported members in other ways too, including contactless delivery of groceries to those who could not go to supermarkets.
"My friend's husband was abused by a person yelling at him to 'go back to China' in Tokoroa and another posted in her group that her Botany house was broken into. Jewelry, earphones and even masks [were] stolen the day before the lockdown.
"The groups allow us to communicate with others close by when such unsafe situations happen to us too."
Many angry responses were also made to screenshots circulated among the groups of a Facebook post by a New Zealand woman who blamed China for the coronavirus and vowed never to buy anything made in China again.
"Many of us are beginning to feel increasingly unsafe," she said.