As stated by Steven Collins, Nelson Area Commander:
Emergency services are responding to an aircraft crash, south of Castor Peak in Nelson.
Police were notified of a plane that had been overdue just before midday and were on standby as Maritime NZ’s Rescue Coordination Centre managed a search response.
At this time, no further information is available. An update will be provided as soon as we are able.
/NZ Police Public Release. View in full here.
