Three runners - including a teenage girl - went missing near the Rotorua lakes district yesterday and had still not been found late last night.
The girl and two men aged 26 set out for a run in an area between Kawerau and Lake Rotoma around 10am.
Relatives raised the alarm when they failed to return.
Two police search and rescue teams, as well as volunteers, searched late into the night. Extra search and rescue members are expected to join the effort this morning.
Sergeant Andrew O'Reilly, the Eastern Bay of Plenty S&R co-ordinator, said there were concerns for the runners, particularly as the forecast was for chilly temperatures.