Christchurch authorities are expected to speak soon after the Christchurch Remembrance Service was cancelled.
The cancellation was announced on Saturday after Prime Minister Jacinda Ardern said the risk was too high.
"This is a pragmatic decision. We're very saddened to cancel, but in remembering such a terrible tragedy, we shouldn't create the risk of further harm being done.
"The advice we received for this event, is that based on people travelling from different parts of the country and from overseas, if there was a case it could be difficult to trace those who had come into contact with that person, so we are taking a cautious approach."
Watch the press conference.